JPH11102261A - Storage control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a storage control system capable of equally stabilizing throughputs of respective host computers by determining the time when the respective computers are connected to a storage device and can access it and allowing each host computer to access the storage means periodically. SOLUTION: A prediction time calculating means 41 calculates a time needed to process commands put in an acceptance queue 40. A grouping means 42 divides the commands according to the time calculated by the prediction time calculating means 41 and the time when respective disk drives 24 to 28 can be accessed continuously. Thus, the time when the respective host computers 22 and 23 can access the disk drives 24 to 28 continuously is determined to allow the host computers to access the disk drives 24 to 28 periodically, so the throughputs of the host computers 22 and 23 are equalized to guarantee the maximum response time and minimum throughput, thereby improving the stability of the whole system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention divides one command or collects a plurality of commands so that commands output from each of a plurality of host computers end in a predetermined unit time, and further outputs the commands from each host computer. The present invention relates to a storage control system that processes divided or grouped commands into one. Especially,
The present invention has an external storage device of a RAID system in which a plurality of disk devices shared by a plurality of computers are combined,
This guarantees a maximum response time and a minimum throughput value with respect to a command output from each host computer constituting the storage control system.

[0002]

2. Description of the Related Art An example of a storage control system is disclosed in, for example, Japanese Patent Application Laid-Open No. Hei 6-19625, which is shown in FIG. FIG. 18 is a configuration diagram showing a configuration of a conventional storage control system. In FIG.
1 is a storage disk unit. Reference numeral 12 denotes a disk connection unit, which is connected to the storage disk unit 10 and the storage disk unit 11. The disk connection unit 12 has a shared memory 13
Is loaded. 14 and 15 are disk control units. These disk control units 14 and 15 are connected to the disk connection unit 12, respectively. Reference numeral 16 denotes an external storage device. The external storage device 16 includes storage disk units 10 to 11, disk control units 14 to 15, and a disk connection unit 12 having a shared memory 13. 17 to 19 are host computers. These host computers 17 to 19 are respectively
It is connected to the disk control unit 14 and the disk control unit 15.

Next, the operation of the conventional storage control system shown in FIG. 18 will be described. Each host computer 17-19
Are the storage disk units 10-1 of the external storage device 16.
A predetermined command is output to access 1.
The commands output from the host computers 17 to 19 are input to the disk control unit 14 or the disk control unit 15. The commands output from the host computers 17 to 19 are sent in accordance with the usage status of the disk control units 14 to 15,
The input destination is changed. For example, a command output from the host computer 17 is input to the disk control unit 14, and the disk control unit 14 accesses the storage disk units 10 to 11 based on the command output from the host computer 17. It is assumed that the control unit 15 is waiting for a command input. In this case, the command output from the host computer 18 is output to the disk control unit 15 in the standby state, and accesses the storage disk units 10 to 11 after the processing of the disk control unit 14 ends.

[0004]

In the above-described conventional storage control system, when a command requesting a large amount of data transfer is output from a certain host computer, for example, the host computer 17 at one time, the external storage device 16 becomes the host. Calculator 17
Is occupied by the other host computers 18-
Even if a certain command is output from the host computer 19, processing based on the command output from the host computer 18 to 19 is made to wait until the processing based on the command output from the host computer 17 ends, and the host computer 18 to 19 However, there is a problem in that the processing capacity of the above is significantly reduced.

The present invention has been made in view of such a problem, and sets a time during which each of the host computers 17 to 19 can access the disk device, and sets a command output from each of the host computers 17 to 19. Predict how long it will take to complete the process based on
One command is divided and processed or a plurality of commands are processed so that the processing based on the command output from each of the host computers 17 to 19 falls within the accessible time given to each of the host computers 17 to 19. Host computer 1 that can access the disk device
7 to 19 are changed periodically, and each host computer 17 to 1 is changed.
Each host computer 1 guarantees the maximum response time and the minimum throughput value for the command output from the host computer 1.
It is an object of the present invention to obtain a storage control system that stabilizes the processing capacity of 7 to 19 equally.

[0006]

A storage control system according to the present invention comprises: a first host computer to which a first command is output; a second host computer to which a second command is output; A first processing time calculating means for calculating a first processing time required for processing the first command based on the first command, and a second processing means connected to the second host computer, A second processing time calculation unit that calculates a second processing time required for processing the second command based on the command, and is connected to the first processing time calculation unit, the first processing time and a predetermined unit time; Based on the first command grouping means for dividing the first command into first subcommands and outputting the first command, and a second processing time calculation means, the processing of which requires a second processing time The second command A second command grouping unit that divides and outputs the second subcommand based on a predetermined unit time and is connected to the first and second command grouping units, and the first and second subcommands are Storage means for processing based on predetermined conditions.

Further, a storage control system according to the present invention comprises a first host computer to which a plurality of first commands are output, a second host computer to which a plurality of second commands are output, Connected to the host computer, a first processing time calculating means for calculating a first processing time required for processing each of the first commands based on each of the first commands,
A second processing time calculating means connected to the second host computer and calculating a second processing time required for processing each of the second commands based on each of the second commands; and a first processing time calculating means. A first command grouping unit that is connected and collects a plurality of first commands that require a first processing time for the processing, and integrates and outputs a first command group based on a predetermined unit time; and A second command that is connected to the processing time calculation means, collects a plurality of second commands that require a second processing time for the processing, and integrates and outputs a second command group based on a predetermined unit time. It is provided with a grouping means, and a storage means connected to the first and second command grouping means, wherein the first and second command groups are processed based on predetermined conditions.

Further, the storage control system according to the present invention comprises a first host computer for outputting a first command, a second host computer for outputting a plurality of second commands, and a first host computer. A first processing time calculating means connected to the computer and calculating a first processing time required for processing the first command based on the first command; and a second command connected to the second host computer. A second processing time calculating means for calculating a second processing time required for processing each of the second commands based on the first processing time and a predetermined unit time, which are connected to the first processing time calculating means. Based on the first command grouping means for dividing the first command into first subcommands and outputting the first command, and a second processing time calculation means, the processing of which requires a second processing time Second frame A second command grouping unit that collects a plurality of commands, integrates them into a second command group based on a predetermined unit time, and outputs the second command group, and is connected to the first and second command grouping units. The command and the second command group are provided with storage means for processing based on predetermined conditions.

Further, in the storage control system according to the present invention, the predetermined condition is that the first subcommand or the second subcommand has a plurality of first commands or a plurality of first commands constituting a first command group. READ command for parity generation of a plurality of second commands constituting a second command group, or of a first subcommand or a plurality of second commands constituting a second command group, of parity generation The READ command and the WRITE command other than the parity command are processed in the order of the READ command for the parity generation, the READ command for the other than the parity generation, and the WRITE command. This is to be processed in parallel with the parity calculation processing based on the READ command for generation.

Further, in the storage control system according to the present invention, the predetermined condition is that the first subcommand and the second subcommand are alternately switched or the first command group and the second command group are switched alternately. Or alternately processing the first subcommand and the second command group.

Further, in the storage control system according to the present invention, the storage means has three or more disk devices and the first disk device among the three or more disk devices stores the first subcommand or the second subcommand. The parity of data based on the second subcommand or the first command group or the second command group is recorded.

Further, the storage control system according to the present invention provides a storage control system in which a failure occurs in a first disk device among three or more disk devices of the storage means and the first disk device is initialized or replaced. The predetermined condition is that the parity or data obtained from the data or parity recorded on the disk devices other than the first disk device is recorded on the first disk device and restored, and the processing time is a predetermined unit time. Alternately, the restoration command and the first subcommand and the second subcommand, or the restoration command and the first command group and the second command group alternately, or the restoration command and the first command Are alternately processed.

Further, the storage control system according to the present invention provides a storage control system in which a failure occurs in a first disk device among three or more disk devices of the storage means and the first disk device is initialized or replaced. The predetermined condition is that the parity or data obtained from the data or parity recorded on the disk devices other than the first disk device is recorded on the first disk device and restored, and the processing time is a predetermined unit time. A recovery READ command for reading data or parity recorded on a disk device other than the first disk device that the recovery command has, and a parity or data based on a read result by the READ command is recorded on the first disk device. Recovery WRITE command and the first subcommand or second subcommand or A plurality of first commands constituting one command group or a plurality of second commands constituting a second command group, or a plurality of second commands constituting a first subcommand or a second command group Has a READ command for parity generation, a READ command other than for parity generation, and a WRITE command, a recovery READ command and a READ command for parity generation,
This is to process in the order of a READ command other than for parity generation, a WRITE command for recovery, and a WRITE command.

Further, in the storage control system according to the present invention, the storage means has a first disk device and a second disk device, and the first and second disk devices are provided with a first subcommand or a second disk device. A second subcommand, or a plurality of first commands constituting a first command group or a plurality of second commands constituting a second command group, or a first subcommand or a second command group READ command for parity generation, READ command for other than parity generation, and WR
Data based on the ITE command is recorded.

Further, the storage control system according to the present invention is designed such that when a failure occurs in the first disk device of the two disk devices of the storage means and the first disk device is initialized or replaced, The condition is that the data recorded on the second disk device is copied to the first disk device and restored, and the recovery command, the first sub-command, and the second Alternately processing a subcommand, or alternately, a restoration command and a first command group and a second command group, or alternately processing a restoration command and a first subcommand and a second command group. That is what it is.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. One embodiment of a storage control system according to the present invention will be described with reference to FIG. FIG. 1 is a configuration diagram showing a configuration of the storage control system according to the first embodiment.
In FIG. 1, reference numeral 20 denotes an external storage device. 21 is a control unit. Reference numerals 22 to 23 denote host computers, each of which is connected to the control unit 21. 24 is a disk device,
It is connected to the control unit 21 via the SCSI bus 29. Numeral 25 also denotes a disk device, which is connected to the control unit 21 via the SCSI bus 30.
Connected to. 26 is also a disk device, and is a SCSI bus 3
1 is connected to the control unit 21. A disk device 27 is connected to the control unit 21 via the SCSI bus 32. Reference numeral 28 denotes a disk device, which is connected to the control unit 21 via the SCSI bus 33.

The external storage device 20 includes these control units 21 and
It comprises SCSI buses 29 to 33 and disk devices 24 to 28. The external storage device 20 uses the control unit 21 to control the host computers 22 to 23 and the disk devices 24 to
28 to control data input / output processing. Control unit 2
1 and the host computer 22 are connected by a Fiber Channel interface 34. The control unit 21 and the host computer 23 are connected by a Fiber Channel interface 35.

Each of the host computers 22 to 23 has a plurality of disk devices 24 to 28 as one disk device.
It is recognized as a RAID group 36. The RAID group 36 is assumed to be at RAID level 5. Disk devices constituting the RAID group 36 of RAID level 5, for example, the disk device 24, store data and other
Parity for restoring 5-28 data is recorded. This parity is recorded in different disk devices 24 to 28 for each predetermined data.

Next, the configuration of the control unit 21 constituting the storage control system of the first embodiment will be described with reference to FIG. FIG. 2 is a block diagram illustrating a configuration of the control unit 21 included in the storage control system according to the first embodiment. In FIG. 2, reference numeral 40 denotes a reception queue, which is a host computer 2
2 or the host computer 23. The reception queue 40 stores commands output from the host computers 22 to 23 in the order in which the commands are input. Reference numeral 41 denotes a predicted time calculating means, which is connected to the reception queue 40,
The time required to process the command stored in 0 is calculated. 42 is a grouping means, which is connected to the predicted time calculation means 41. This grouping means 4
2 is based on the time required to process the target command calculated by the predicted time calculation means 41 and the time T during which each of the host computers 22 to 23 can continuously access the disk devices 24 to 28, The command is divided into a plurality of commands, or a plurality of commands are grouped into one command. The time during which the host computers 22 to 23 can continuously access the disk devices 24 to 28 is called a disk occupation time.

Reference numeral 43 denotes a storage queue, which is connected to the grouping means 42 and stores commands generated by the grouping means 42. Reference numeral 44 denotes a command receiving unit, which includes the receiving queue 40, the predicted time calculating unit 41, the grouping unit 42, and the storage queue 43. 4
Reference numeral 5 denotes a command / batch unit, which is connected to the storage queue 43. The command / batch means 45 includes a storage queue 43 in which commands divided or grouped after being output from the host computer 22 are stored, and a storage queue 43 in which commands divided or grouped after being output from the host computer 23 are stored. From the queue 43,
The respective commands are taken out, and these two commands are combined into one to create a command group in which the disk occupation time is within 2T.

Reference numeral 46 denotes a storage queue, which is connected to the command / batch means 45 and stores a command group generated by the command / batch means 45. Reference numeral 47 denotes a command / batch unit, which includes a command / batch unit 45 and a storage queue 46. 48 is a command conversion means, which is connected to the storage queue 46. This command conversion means 48
Converts the command group stored in the storage queue 46 into a command suitable for the disk devices 24 to 28 that output the command group. Reference numeral 49 denotes a command conversion unit.
Consists of eight.

Reference numeral 50 denotes a command transmission unit which is connected to the command conversion means 48 and outputs a command group generated by the command conversion means 48. Reference numeral 51 denotes a command issuing queue, which is connected to the command transmitting unit 50. Also,
The command issuance queue 51 is stored in the disk device 24 or the disk device 25 or the disk device 26 or the disk device 2
7 or the disk device 28. In the command issuing queue 51, a command group output from the command transmitting unit 50 is stored. A command processing unit 52 includes a command transmitting unit 50 and a command issuing queue 51. The command receiving unit 44, the command batch unit 47, the command converting unit 49, and the command processing unit 52
Thus, the control unit 21 is configured.

As described above, in the storage control system according to the present embodiment, each of the host computers 22 to 23 includes the disk devices 24 to
28, the host computers 22-23 periodically access the disk devices 24-28, so that the processing capabilities of the host computers 22-23 are averaged, and the maximum response time and Minimum throughput is guaranteed and overall system stability is improved.
In the storage control system according to the present embodiment, since the disk devices 24 to 28 form a RAID group,
The system can be used stably even when the ID group is in the normal operation mode or the degenerate operation mode.

Next, the operation of the storage control system shown in FIG. 2 will be described. FIG. 2 is a conceptual diagram illustrating the storage control system according to the first embodiment. In FIG. 2, the receiving queue 4
0 is connected to each of the host computers 22 to 23. The commands output from the host computers 22 to 23 are stored in the receiving queue 40 connected to each of the host computers 22 to 23 in the order of arrival. And
The command output from the reception queue 40 is input to a predicted time calculation unit 41, and the predicted time calculation unit 41 calculates a predicted processing time that is considered to be required for processing each command. After that, the grouping unit 42 groups the commands based on the processing time of each command predicted and calculated by the predicted time calculation unit 41 so that the commands can be processed within a predetermined time. The reference time for this grouping is the disk occupation time T, which is the time during which the host computers 22 to 23 can continuously access the disk devices 24 to 28.

Next, the command / batch unit 45 takes out the commands grouped and stored by the grouping unit 42 from the storage queue 43. The command group extracted from the storage queue 43 is a command group that can be processed within the disk occupation time T accessible by each of the host computers 22 to 23 to each of the disk devices 24 to 28. For example, a 64 KB READ command 1 Or one 1KB READ command. Further, the command / batch unit 45 extracts a command group from each of the storage queues 43 connected to the host computers 22 to 23, outputs a command group obtained by combining the plurality of command groups into one to the storage queue 46, and stores the command group. Let it.

Next, the operation of the command receiving section 44 of the storage control system shown in FIG. 3 will be further described.
FIG. 3 is a conceptual diagram illustrating processing of the command receiving unit 44 of the storage control system according to the first embodiment. In FIG. 3, it is assumed that a 128 KB READ command, a 256 KB READ command, and a plurality of 1 KB READ commands are output from the host computer 22 to the reception queue 40. The host computer 2
It is assumed that the disk occupation time of 2 is T, the processing time for one 64 KB READ command, or the processing time for four 1 KB READ commands. In addition, 128KB REA
The D command is divided into two 6
Divided into 4KB READ commands. In addition, 256KB READ
The command is divided into four 64 KB READ commands.
On the other hand, four 1 KB READ commands are processed collectively by the grouping means 42.

Next, the operation of the command conversion means 48 of the storage control system shown in FIG. 4 will be further described. FIG. 4 is a conceptual diagram illustrating processing of the command conversion unit 48 of the storage control system according to the first embodiment. In FIG. 4, reference numeral 60 denotes a command group converted by the command conversion unit 48 for each of the disk devices 24 to 28. This command group 60 is output from the command conversion means 48,
It is input to the command transmission unit 50. This command group 60
Is composed of three types of command groups. Reference numeral 61 denotes a parity generation command group, which is a group of READ commands for reading old data or old parity for generating a new parity.

Reference numeral 62 denotes a READ command group, which is a group of READ commands other than parity generation output from the host computers 22 to 23 and converted by the command conversion means 48. Reference numeral 63 denotes a WRITE command group, which is a host computer 22.
23 and converted by the command conversion means 48.
It is a group of WRITE commands or WRITE commands for writing new parity to the disk devices 24-28.

The command conversion means 48 converts the command group generated by the command / batch means 45 and stored in the storage queue 46 into a command group for the corresponding disk devices 24 to 28 and outputs the command group. For example, 512B WRITE
The command and the 1 KB READ command are repeated in order, and a command group α including a total of four commands is stored in the storage queue 4.
6 shows the case where it is input. These 512B WRIT
It is assumed that the time required to process the command group α in which two E commands and two 1KB READ commands are combined into one is within a predetermined disk occupation time T.

The parity generation command group 6 shown in FIG.
1, the numbers in parentheses after each command constituting the READ command group 62 and the WRITE command group 63 are as follows:
Indicates the leading logical address of the access destination disk device. The capacity of one sector of each disk device starting with an arbitrary logical address is 512 bytes (hereinafter referred to as B). Command group α stored in storage queue 46
Is converted by the command conversion means 48 as follows.

First, the 512B WRITE command (0) is
A first READ command for reading old data of a predetermined write destination (for example, disk A) and a second R for reading old parity of a predetermined write destination (for example, disk E)
The EAD command and the specified write destination (disk
This is converted into four commands: a first WRITE command for writing new data into A) and a second WRITE command for reading new parity into the above-mentioned predetermined write destination (disk E). Note that the 512B WRITE command (8) is similarly converted. The first and second READ commands constitute a parity generation command group 61. The first WRITE command and the second WRITE command constitute a WRITE command group 63.

Next, the 1KB READ command (4) is converted into two READ commands, for example, a 512B READ command for the disk D and a 512B READ command for the disk E. This is because the sector size of the disk devices 24-28, which can be output from the command transmitting unit 50 to which the command converted by the command conversion unit 48 is input, is 512B, and the data to be read is stored across the disks D and E. Because it is. In addition,
The 1 KB READ command (12) is similarly converted. The 512B READ command for the disk D and the 512B READ command for the disk E
The D command group 62 is constituted.

The parity generation command group 61 and the READ command group 6 converted by the command conversion means 48
2. The WRITE command group 63 is sequentially transmitted to the command transmission unit 5
Output to 0. Thereafter, the command transmitting unit 50 transmits the parity generation command group 61, the READ command group 62,
These command groups 61 in the order of the WRITE command group 63
To 63 are output to the command issue queue 51 and processed in order. The command groups 61 to 63 are output to the command issuance queue 51 because the command groups 61 in the previous order are output.
It is desirable that all the processes except for one of the commands composing -63 are completed.

The parity generation command group 61, the READ command group 62, and the WRITE command group 63 output from the command issuance queue 51 include the disk units 24-28.
Is output to In the present embodiment, these five disk devices 24 to 28 form a RAID group 36, and are regarded as one disk device by the host computers 22 to 23. It should be noted that the five disk devices 24 to 28 constituting the RAID group 36 are connected to different SCSI buses 29 respectively.
To the command transmission unit 50 via the command issue queue 51.

In order to execute one READ command output from the storage queue 46 to a predetermined disk device, the command conversion means 48 converts the command into a command and outputs one command to the predetermined disk device. Output a command. Also, one WR output from the storage queue 46
In order to execute the ITE command to the specified disk device,
The command conversion means 48 converts the command into a command and outputs two commands to a predetermined disk device.

It should be noted that one WRITE command in the storage queue 46 is converted into two commands by command conversion. The reason for this is that a READ command for reading old data or old parity in order to generate a new parity and a READ command for reading old parity. And a WRITE command for writing new data or new parity. As the external storage device 20, a READ command for reading old data or old parity to generate the new parity, and a WRITE for writing new data or new parity are used.
By processing the command, it is considered that one WRITE command has been executed by one disk device.

Next, a procedure of command processing by the storage control system of the first embodiment will be described with reference to FIG. 5 in comparison with a command processing procedure by a conventional storage control system. FIG. 5 is a conceptual diagram illustrating a command processing procedure by the storage control system according to the first embodiment and a command processing procedure by the conventional storage control system. In FIG. 5, a 32 KB WRITE command and a 64 KB WRITE command
A conventional storage control system processing a READ command in order, a 32 KB WRITE command, and a 64 KB R
The processing procedure of the storage control system according to the first embodiment in which the EAD command forms one command group and processes this command group has been described.

In FIG. 5, the upper example shows a processing procedure when the conventional storage control system processes a command group consisting of a 32 KB WRITE command and a 64 KB READ command. In addition, the present method at the bottom illustrates a processing procedure when the storage control system of the first embodiment processes a command group including a 32 KB WRITE command and a 64 KB READ command.

In a conventional storage control system, a 32 KB WRI
The TE command and the 64KB READ command are sequentially processed. In executing the 32KB WRITE command,
A 32 KB READ command is executed in advance, and arithmetic processing is performed thereafter. This is because the disk device of the conventional storage control system applies RAID level 5, reads data and parity up to that time for parity update, and reads the read data and parity and new write data. It is generated to calculate a new parity based on the original parity.

As described above, in the conventional storage control system, since the 64 KB READ command and the 32 KB WRITE command are processed in order, the time required for the arithmetic processing accompanying the processing of the 32 KB WRITE command is also reduced by the 64 KB READ command and the 32 KB write command. This constitutes a part of the processing time required for terminating the WRITE command. On the other hand, Embodiment 1
In the storage control system, 32KB WRITE with arithmetic processing
The 32 KB READ command for executing the command is executed first in the commands constituting the command group.

While the arithmetic processing is being performed, a 64 KB READ command irrelevant to the arithmetic processing is executed. That is, the arithmetic processing accompanying the 32 KB READ command and the processing of the 64 KB READ command are performed simultaneously.
Thereafter, when the processing of the 64 KB READ command ends and the arithmetic processing associated with the 32 KB READ command ends, 32 KB WRITE based on the calculation result of this arithmetic processing.
The command is executed.

As described above, while executing the processing of the READ command for parity generation and calculating the new parity from the data read by this processing, the processing of the normal READ command is executed to execute the processing of the new parity. By performing the calculation process and the normal READ command process in parallel, command processing is not performed during the time α (minute) required to calculate a new parity as in the conventional storage control system. The occurrence of a wait state is prevented, the processing time required for processing a command group is reduced, and a series of processing is made more efficient.

In FIG. 6, as in FIG. 5, the storage control system of the first embodiment summarizes the predetermined commands as a command group rather than the processing time required for the conventional storage control system to process the predetermined commands. This indicates that the processing time required to perform the processing is shorter. FIG.
FIG. 3 is a conceptual diagram illustrating a processing time of a command processing by a storage control system according to the first embodiment and a processing time of a command by a conventional storage control system.

In FIG. 6, the 64 KB READ command 1
And the processing time of the conventional storage control system for processing four commands and four 1 KB WRITE commands in sequence, and one embodiment in which one 64 KB READ command and four 32 KB WRITE commands form one command group and process this command group. 1 shows the processing time of the storage control system. Also, 64KB REA
One D command is output from the host 1, and four 1KB WRITE commands are output from the host 2. Furthermore, in the storage control system of the first embodiment, these 64 KB
It is assumed that one READ command and four 1KB WRITE commands are combined into one command group by the command batch unit 47.

The command output from a plurality of hosts is 1
One command group can be grouped into the disk units 24 to
28, the number of commands output at one time is increased. Therefore, the disk devices 24 to 28 serving as hosts
Can use a reordering function for changing the processing order of commands possessed by the respective disk devices 24-28.
It is possible to increase the ratio of parallel processing with the processing of the AD command, and to reduce the time required for processing all commands as compared with processing all commands constituting the command group one by one.

Embodiment 2 Another embodiment of the storage control system according to the present invention will be described with reference to FIG.
FIG. 7 is a configuration diagram showing the configuration of the storage control system according to the second embodiment. In FIG. 7, reference numerals 70 to 71 denote host computers. A control unit 72 is connected to the host computer 70 and the host computer 71. Note that the host computer 7
0 is connected to the control unit 72 via the Fiber Channel interface 73. Also, the host computer 71
The control unit 72 via the bre Channel interface 74
Connected to.

Reference numeral 75 denotes a disk device, which is a SCSI bus 77.
Is connected to the control unit 72 via A disk device 76 is connected to the control unit 72 via a SCSI bus 78. The disk device 75 and the disk device 7
6 is recognized by each of the host computers 70 to 71 as one RAID group 80 as one disk device.
It is assumed that the RAID group 36 is at RAID level 1. The same data as the disk device 76 is recorded on the disk devices constituting the RAID group 80 of the RAID level 1, for example, the disk device 75. The control unit 72
Are the host computers 70 to 71 and the disk devices 75 to
76 to control data input / output. Reference numeral 81 denotes an external storage device, which includes a control unit 72, SCSI buses 77 to 78, and disk devices 75 to 76.

Next, the operation of the storage control system shown in FIG. 8 will be described. FIG. 8 is a conceptual diagram illustrating the storage control system according to the second embodiment. In the storage control system according to the second embodiment, the command conversion means 48 copies the WRITE commands by the number of disk devices 75 to 76,
The command is converted so that the READ command is output only to a disk device with a small load. In FIG. 8, the same or corresponding parts as those in the first embodiment shown in FIG. 2 are denoted by the same reference numerals, and the description thereof will be omitted, and the parts different from FIG. 2 will be described.

Next, the operation of the command conversion means 48 of the storage control system shown in FIG. 9 will be further described mainly. FIG. 9 is a conceptual diagram illustrating processing of the command conversion unit 48 of the storage control system according to the second embodiment. In FIG. 9, reference numeral 90 denotes a command group.
Is obtained by The command conversion means 48
The command group at the stage stored in the storage queue 46 before the conversion is defined as a command group β. This command group β includes two 1 KB WRITE commands and two 1 KB READ commands, each of which is composed of a 1 KB WRITE command and a 1 KB command.
The READ command is repeated in order, and four commands are combined. The command group β in which the two 1KB WRITE commands and the two 1KB READ commands are combined into one is a command group predicted to be processed within the predetermined disk occupation time T and generated.

The command group β is converted by the command conversion means 48 as described below. First, 1KB WRITE
The command is converted into two WRITE commands, for example, a 1 KB WRITE command for disk A and a 1 KB WRITE command for disk B. This is because the same data is written to both of the disk devices 75 to 76 which are mirror disks. The 1 KB READ command is a command group 90 output to the disk device 75 or a command group 90 output to the disk device 76 so that the processing load is not concentrated according to the processing capacity of each of the disk devices 75 to 76. It is incorporated in either one. That is, the command group β is converted by the command conversion unit 48 into a plurality of command groups 90 having different types of composing commands.

As described above, in the storage control system according to the present embodiment, each of the host computers 70 to 71 includes the disk devices 75 to
76, the host computers 70 to 71 periodically access the disk devices 75 to 76 by determining the time during which the host computers 70 to 71 can be continuously accessed. Minimum throughput is guaranteed and overall system stability is improved.

Embodiment 3 FIG. Another embodiment of the storage control system according to the present invention will be described with reference to FIG. FIG. 10 is a block diagram showing a configuration of a storage control system capable of switching from a normal operation mode to a degenerate operation mode according to the third embodiment. Note that this switching process is performed even if the RAID level of the disk device is RAID level 5 or RAID level 1
However, the same processing is performed. FIG. 10 illustrates a storage control system in which the external storage device 81 of RAID level 1 is used. In FIG. 10, reference numeral 100 denotes an I / O processing unit, which is connected to the host computers 70 to 71 and the disk devices 75 to 76. The I / O processing unit 100 controls command processing in the command issue queue 51.

Reference numeral 101 denotes a termination processing unit, which is connected to the host computers 70 to 71 and the disk devices 75 to 76.
The termination processing unit 101 determines whether the command processing has ended normally or has ended in error. An operation switching unit 102 includes a command conversion unit 48 and an end processing unit 101.
Connected to. This operation switching means 102 switches from the normal operation mode to the degenerate operation mode to switch to the external storage device 81.
Start.

Reference numeral 103 denotes a conversion unit (0), which is connected to the storage queue 46 and the command transmission unit 50. Reference numeral 104 denotes a conversion unit (1), which is provided in parallel with the conversion unit (0) 103. The command conversion means 48 converts these conversion units (0) 1
03 and a conversion unit (1) 104. Then, a command group is alternately input to these conversion units (0) 103 and (1) 104. In addition, these conversion units (0)
The command groups input to 103 and the conversion unit (1) 104 are processed alternately. In FIG. 10, the same or corresponding parts as those of the second embodiment shown in FIG. 8 are denoted by the same reference numerals, and the description thereof will be omitted, and the parts different from FIG. 8 will be described.

Next, FIG. 11 shows how a failure occurs while the storage control system is processing a command group, for example, the command group C, and the mode of the storage control system is switched from normal operation to degenerate operation. It will be described using FIG. FIG. 11 is a conceptual diagram illustrating switching of the operation mode of the storage control system according to the third embodiment. In FIG. 11, it is assumed that there are four command groups A, B, C, and D grouped by the command / batch means 45. These command groups A, B, C, and D are command group A, command group B,
The command group C and the command group D are output from the command / batch unit 45 in this order. Command group A is conversion unit (0)
103 is input. The command group B is input to the conversion unit (1) 104. Further, the command group C is
Subsequent to the command group A, it is input to the conversion unit (0) 103. The command group D is input to the conversion unit (1) 104 following the command group B.

A process flow in the case where an error occurs in executing the command group C and the storage control system is switched from the normal operation mode to the degenerate operation mode when the error is detected is shown in the lower part. It should be noted that the processing flow in the case where the storage control system has been normally started without any error occurring is shown in the upper stage at the normal time. Each of the command groups A to D is a predetermined time (TN) calculated from “the occupation time (T) of the disk device assigned to each host computer × the number of host computers (N) connected to the external storage device”. It is assumed that the set of commands can be processed within the parentheses.

During normal operation, the storage control system
1 is performed as shown in the normal state. The command groups A and B grouped and generated by the command / batch unit 47 are converted by the command conversion unit 48.
Here, the command group A is transmitted by the command transmitting unit 50.
The data is output to a predetermined disk device and processed by the I / O processing unit 100 and the termination processing unit 101. The other command group B, except for one command constituting the command group A, is in a waiting state until the processing of the command group A is almost completed.

When all the processing based on the command group A is completed, the command / batch unit 47 takes out the next command group from the storage queue 43 grouped and stored for each host computer, and generates a command group C. The generated command group C is transmitted to the command conversion unit 48.
, But in a waiting state. Similarly, when all the processing of the command group B is completed, a command group D is generated.

Next, a switching process for switching the operation mode of the storage control system from the normal operation to the degenerate operation will be described below. The termination processing unit 101 detects whether or not the processing of a command constituting a command group has ended in error. Then, when the termination processing unit 101 detects the error termination, the operation switching unit 102 switches the operation mode of the external storage device 81 to the reduced operation mode. For example, let us consider a case where an error occurs in the processing of a command constituting the command group C and the processing of the command ends. In this case, the termination processing unit 101 waits for a response from each of the disk devices 75 to 76 based on the processing of the command, and suspends the processing of the next command. After receiving a response from each of the disk devices 75 to 76, the termination processing unit 101
Then, the command is switched to the degenerate operation mode, and the command conversion unit 48 converts the command again so that the uncompleted command in the command group C is operated in the degenerate operation mode.

The command group D, which should have been processed after the command group C, is assumed to be processed in the normal operation mode, and has already been command-converted. Perform command conversion again.

As described above, when the operation mode is switched by the operation switching unit 102, the command conversion unit 48
All commands that have not been completed after the command in which the error has occurred are assumed to operate in the degenerate operation mode, the command is converted again, and the command processing is continuously executed. Therefore, even if an error occurs, the operation mode can be switched to avoid an immediate failure, and the external storage control unit 72 reports to the host computers 70 to 71 that the error has occurred. It is possible to continue the processing without any processing.

At this time, the command group C to which the erroneous command belongs and the command group D to be processed immediately after the command group C are set to the reduced operation mode changed by the external storage control unit 72. The command is converted again to the corresponding command. Therefore, the processing of the command groups C to D has a slight delay, and the response to the host computers 70 to 71 is also delayed. As shown in FIG.
The time required for the processing of the command group C is a maximum of “double the number of (the number of host computers connected to the external storage device × the disk occupation time) + the time required for re-converting the command”. The processing of the command group C is guaranteed to be completed within "twice the number of host computers connected to the server x the disk occupation time) + the time required for command re-conversion.

Embodiment 4 Another embodiment of the storage control system according to the present invention will be described with reference to FIG. FIG. 12 is a block diagram showing a configuration of a storage control system for restoring from the reduced operation mode to the normal operation mode according to the fourth embodiment. This storage control system performs similar processing whether the RAID level of the disk device is RAID level 5 or RAID level 1. In FIG. 12, RAID level 5
1 illustrates a storage control system in which the external storage device 20 is used. In FIG. 12, reference numeral 110 denotes recovery instruction means, which is connected to the host computers 22 to 23. Reference numeral 111 denotes a virtual host, which is connected to the recovery instruction unit 110. The virtual host 111 starts up in accordance with instructions from the host computers 22 to 23 input via the restoration instruction means 110, and performs data restoration processing.

Each of the virtual host 111 and the host computers 22 to 23 is independently connected to a command receiving unit 44. A plurality of command receiving units 44 connected to the virtual host 111 and the host computers 22 to 23 are connected to one command / batch unit 45. Then, the command / batch unit 45 extracts a command from each of the plurality of command receiving units 44, and creates a command group in which the plurality of commands are combined into one.

The command extracted from the command receiving unit 44 is a command divided or grouped by the grouping means 42 of the command receiving unit 44 so that the command can be processed in a predetermined unit time T. Then, a command group obtained by combining a plurality of commands is taken out from each command receiving unit 44 and combined, so that the disk occupation time of each of the disk devices 24 to 28 according to the number of command receiving units 44 is 3T. A group of commands within is created. The predetermined unit time T is
Each of the host computers 22 to 23 has a certain disk device 24 to
28 corresponds to a time T during which continuous access is possible. In FIG. 12, the same or corresponding parts as those in the first embodiment shown in FIG.
The part different from FIG. 2 has been described.

Next, the operation of the command conversion means 48 for restoring the disk device shown in FIG. 13 will be further described mainly. FIG. 13 is a conceptual diagram illustrating the processing of the command conversion unit 48 of the storage control system according to the fourth embodiment. In addition,
The disk device to be restored, which needs to replace the existing disk device and restore the recorded contents of the previously provided disk device, is referred to as a disk A. In FIG. 13, a command group 120 includes two types of command groups obtained by converting the command group γ stored in the storage queue 46 by the command conversion unit 48. Reference numeral 121 denotes a recovery processing READ command group. The recovery processing READ command group 121 includes a READ command for restoring the recorded content of the disk A from which the recorded content has been lost and reading predetermined data recorded in each disk device other than the disk A.

The recovery processing READ command group 12
1 READ command is executed, and predetermined data is obtained from each disk device other than the disk A. Then, based on these predetermined data, restoration data for restoring the recorded contents of the disk A is generated. Reference numeral 122 denotes a recovery processing WRITE command group, which has a WRITE command for writing the generated recovery data to the disk A.

Next, the command conversion means 48 shown in FIG.
A description will be given of a disk device recovery process according to the first embodiment. The disk device on which the restoration process is performed is referred to as a disk A. Further, no command is output from the host computers 22 to 23, and the data recovery 3
Assume that only a 2KB WRITE command has been output. The WRITE command output from the virtual host is input to the command conversion unit 48 via the command receiving unit 44 and the command batch unit 47. The command conversion means 48
Based on the input WRITE command based on a READ command for reading data for calculating the recorded content of the failed disk device from a disk device other than the failed disk device, and data read by the preceding READ command. Write the calculated data to the disk unit that needs to be recovered by replacing the failed disk unit.
Convert to command.

The READ command obtained by the conversion by the command conversion means 48 is converted so as to be output to each of the disks B to E. The WRITE command obtained by the conversion by the command conversion means 48 is converted so as to be output to the disk A.
Note that the WRITE command obtained by conversion by the command conversion means 48 is a result of executing a 32 KB READ command output to each of the disks B to E and performing an arithmetic process based on the result read from each disk device. Is generated using

The WRIT for data recovery from the virtual host
The E command is output and the host computers 22 to 2
3 outputs a READ command or a WRITE command, the command / batch unit 45
23 are distinguished from commands output from the virtual host 111. Then, the command / batch unit 45 performs processing based on the command output from the host computers 22 to 23 and data recovery processing based on the command output from the virtual host 111 in the same area of the same disk A. So that the processing by these commands is performed in a different order.

As a specific processing procedure flow, first, in the storage control system of this embodiment, the host computers 22 to
When any one of the storage devices 23 instructs data recovery of one of the disk devices 24 to 28, the virtual host 111 is activated via the recovery instruction means 110. This virtual host 1
From 11, disk devices 24 to 28 to be restored
, A WRITE command for writing the recovery data is output. The WRITE command output from the virtual host 111 is divided or grouped into commands that can be processed by the command receiving unit 44 within the disk occupation time T.

Then, in the command / batch means 45,
The commands output from the virtual host 111 and the host computers 22 to 23 and divided or grouped are combined into one to generate a command group. The generated command group is stored in the storage queue 46. The obtained command group is “(external storage device 2
The number of commands that can be processed within the range of “number of host computers 22 to 23 connected to 0 + number of virtual hosts (1)) × disk occupation time T”.

The command transmitting section 50 performs a READ for recovery processing.
Command group 121, WRITE command group 12 for recovery processing
The command groups 121 to 122 are output to the command issue queue 51 in the order of 2.
Step 2 is executed. The WRITE command group 122 is output to the command issuance queue 51 when the WRITE command is created based on the processing result of the READ command, and thus, when the processing of the READ command group 121 is completely completed.

The command group input to the command conversion means 48 includes five types of a parity generation READ command 61, a READ command group 62, a WRITE command 63, a recovery processing READ command group 121, and a recovery processing WRITE command group 122. Is converted to The recovery processing READ command group 121 (1) and the recovery processing WRITE command group 122
(2), parity generation READ command group 61 (3), RE
AD command group 62 (4), WRITE command group 63 (5)
Are output to the respective disks A to E via the command transmission unit 50 in the order of (1) to (5) and processed. FIG. 14 shows that the processing based on the command output from the host computers 22 to 23 and the data recovery processing based on the command output from the virtual host 111 are performed in different orders.

As described above, the storage control system according to the present embodiment creates a command group by dividing or combining commands output from the host computer based on the predetermined disk occupation time. Further, in this storage control system, each command group obtained corresponding to the commands output from each of the host computers 22 to 23 is collectively processed.
For this reason, the storage control system according to the present embodiment sets each of the host computers 22 to 23 within “(the number of host computers connected to the external storage device + one virtual host computer for data recovery) × disk occupation time”. The processing of the command group corresponding to the command output from is completed, and the progress of the processing equivalent to all the host computers 22 to 23 can be guaranteed.

Embodiment 5 Next, the host computers 22 to
FIG. 15 shows the order in which the processing based on the command output from 23 and the data recovery processing based on the command output from the virtual host 111 are performed in a different order from FIG.

When the command processing based on the command output from the host computers 22 to 23 and the data recovery processing to the recovery target disk device based on the command output from the virtual host are performed at the same time, the types of commands include
READ command group 61 for parity generation, READ command group 6
2. There are five types: a WRITE command group 63, a recovery processing READ command group 121, and a recovery processing WRITE command group 122. These parity generation READ commands 61,
The READ command group 62, the WRITE command group 63, the recovery processing READ command group 121, and the recovery processing WRITE command group 122 may be processed in this order, but the order of the processed commands may be changed as described below. .

The READ command group 121 for the recovery process and the READ command group 61 for the parity generation are both data reading processes, so that they can be processed continuously and collectively. Also, the WRITE command group 122 for the recovery process
And the WRITE command group 63 can be processed continuously since the disk device to which the command is output does not overlap except for the area to be recovered by the data recovery processing in the command group. It is.

As described above, the parity generation READ command group 61, the READ command group 62, the WRITE command group 63,
READ command group 121 for recovery processing and WRIT for recovery processing
The various command groups processed in five steps in the order of the E command group 122 are the recovery processing READ command group 1
21 and a parity generation READ command group for collectively processing the parity generation READ command group 61 and other READ commands.
Command group and WRITE command group 122 for recovery processing and W
The RITE command group 63 may be changed to a three-stage command group which is processed in the order of the WRITE command group for collectively processing.

The WRITE command group for recovery processing 122
If it is determined that both the WRITE command group 63 and the WRITE command group 63 will access the area of the disk device to be recovered by the data recovery processing in the command group, the RAID group including a plurality of disk devices is switched to the degraded mode. , The two command groups are respectively command-converted for the degenerate mode, and the command processing and the recovery processing are performed.

The method of converting commands for each mode is as follows.
The last block of the restored data is managed by the pointer. Then, in order to perform command conversion for each mode, the command conversion unit 49 confirms whether or not each command accesses a data-restored area based on the logical address of each command. Then, the command conversion unit 49
Converts the command so as to adapt to the normal mode if the WRITE command processing is performed on the data restored area, and converts the command so as to adapt to the degenerate mode if the WRITE command processing is performed on the unrecovered area. Naturally, the operation mode of the storage control system can be switched together with the change of the command mode. As mentioned above,
Since the processing of the command group can be summarized in three stages, the processing speed can be further improved.

Embodiment 6 FIG. Another embodiment of the storage control system according to the present invention will be described with reference to FIG. FIG. 16 is a block diagram showing a configuration of a storage control system for restoring from the reduced operation mode to the normal operation mode according to the sixth embodiment. FIG. 16 illustrates a storage control system in which the external storage device 20 of RAID level 1 is used. In FIG. 16, reference numeral 130 denotes recovery instruction means, which is connected to the host computers 70 to 71. Reference numeral 131 denotes a virtual host, which is connected to the recovery instruction unit 130. The virtual host 131 starts up in accordance with instructions from the host computers 70 to 71 input via the restoration instruction means 130, and performs data restoration processing. The command receiving unit 44 is independently connected to each of the virtual host 131 and the host computers 70 to 71. Also, in FIG.
The same or corresponding portions as those of the fourth embodiment are denoted by the same reference numerals, the description thereof is omitted, and portions different from FIG. 12 are described.

Next, the order in which the processing based on the command output from the host computers 70 to 71 and the data recovery processing based on the command output from the virtual host 131 are performed will be described with reference to FIG. Commands output from host computers 70 to 71 and virtual host 1
The commands output from 31 are input to command conversion means 48 via different command receiving units 44 and command batch units 47, respectively. The virtual host 1
31 outputs a command for data restoration,
READ command or WRIT from host computer 70-71
When the E command is output, the command / batch unit 45
Distinguishes between commands output from the host computers 70 to 71 and commands output from the virtual host 111.

The command group input to the command conversion means 48 is converted into three types: a command group 90, a recovery processing READ command group 121, and a recovery processing WRITE command group 122. Then, the recovery processing READ command group 12
1 (1), WRITE command group for recovery processing 122 (2),
In the order of the command group 90 (3), these command groups are output to each disk device via the command transmission unit 50. Then, in each disk device, processing based on the command group is performed. The command / batch unit 4
5 indicates that processing based on the command output from the host computers 70 to 71 and data recovery processing based on the command output from the virtual host 131 are not performed in the same area of the same disk device. Ensure that commands are processed in different orders. Performing the processing based on the command output from the host computers 70 to 71 and the data recovery processing based on the command output from the virtual host 131 in different orders requires that the two processing be performed in the same area of the same disk device. Prevent it from being done.

[0085]

According to the storage control system of the present invention,
A first host computer from which a first command is output, a second host computer from which a second command is output, and a first host computer connected to the first host computer and configured to execute the first command based on the first command. A first processing time calculating means for calculating a first processing time required for the processing, and a second processing time required for processing the second command based on the second command, connected to the second host computer The second processing time calculation means to be connected to the first processing time calculation means, based on the first processing time and a predetermined unit time, the first command is divided into first subcommands and output. The first command to do
A second command that is connected to the grouping unit and the second processing time calculation unit and that divides a second command requiring a second processing time for the processing into a second subcommand based on a predetermined unit time and outputs the divided second command; Command grouping means, connected to the first and second command grouping means,
Storage means for processing the first and second subcommands on the basis of predetermined conditions, wherein each host computer determines a continuous access time to the storage means, and each host computer periodically stores the storage means; Therefore, the processing capacity of each host computer is averaged, the maximum response time and the minimum throughput are guaranteed, and the stability of the entire system is improved.

The storage control system according to the present invention comprises a first host computer to which a plurality of first commands are output, a second host computer to which a plurality of second commands are output, Connected to the host computer, a first processing time calculating means for calculating a first processing time required for processing each of the first commands based on each of the first commands,
A second processing time calculating means connected to the second host computer and calculating a second processing time required for processing each of the second commands based on each of the second commands; and a first processing time calculating means. A first command grouping unit that is connected, collects a plurality of first commands that require a first processing time for the processing, and integrates and outputs a first command group based on a predetermined unit time; and A second command which is connected to the processing time calculating means, collects a plurality of second commands which require a second processing time for the processing, and integrates and outputs the second command group based on a predetermined unit time. Grouping means, and storage means connected to the first and second command grouping means, wherein the first and second command groups are processed based on predetermined conditions, and each host computer is connected to the storage means Since each host computer periodically accesses the storage unit by setting the access time, the processing capacity of each host computer is averaged, the maximum response time and the minimum throughput are guaranteed, and the stability of the entire system is improved. I do.

Further, the storage control system according to the present invention comprises a first host computer to which a first command is output, a second host computer to which a plurality of second commands are output, and a first host computer. A first processing time calculating means connected to the computer and calculating a first processing time required for processing the first command based on the first command; and a second command connected to the second host computer. A second processing time calculating means for calculating a second processing time required for processing each of the second commands based on the first processing time and a predetermined unit time, which are connected to the first processing time calculating means. Based on the first command grouping means for dividing the first command into first subcommands and outputting the first command, and a second processing time calculation means, the processing of which requires a second processing time Second frame A second command grouping means for collecting a plurality of commands, integrating them into a second command group based on a predetermined unit time, and outputting the second command group; The command and the second command group are provided with a storage unit that is processed based on a predetermined condition. Each host computer determines a time during which the storage unit can be continuously accessed, and each host computer periodically stores the command in the storage unit. For access, the processing capacity of each host computer is averaged, the maximum response time and the minimum throughput are guaranteed, and the stability of the entire system is improved.

Further, in the storage control system according to the present invention, the predetermined condition is that the first subcommand or the second subcommand has a plurality of first commands or a plurality of first commands constituting a first command group. READ command for parity generation of a plurality of second commands constituting a second command group, or of a first subcommand or a plurality of second commands constituting a second command group, of parity generation The READ command and the WRITE command other than the parity command are processed in the order of the READ command for the parity generation, the READ command for the other than the parity generation, and the WRITE command. Since the processing is performed in parallel with the parity calculation processing based on the READ command for generation, the READ By the amount of time the operation processing associated with the de, can shorten the time required for a series of command processing.

Further, in the storage control system according to the present invention, the predetermined condition is such that the first sub-command and the second sub-command are alternately switched or the first command group and the second command group are alternately switched. Or the first subcommand and the second command group are alternately processed, so that each host computer can access the storage means periodically, so that the processing capacity of each host computer is averaged, The maximum response time and the minimum throughput are guaranteed, and the stability of the whole system is improved.

Further, in the storage control system according to the present invention, the storage means has three or more storage means, and the first storage means among the three or more storage means stores the first subcommand or the second storage means. The parity of the data based on the second subcommand or the first command group or the second command group is recorded, and even if any one of the storage units fails, the parity is recorded on storage units other than the failed storage unit. The data recorded in the failed storage means can be calculated and calculated from the stored data, so that the arithmetic processing of the host computer connected to each storage means can be continuously performed, and the reliability of the entire system can be improved. The performance is improved.

Further, in the storage control system according to the present invention, when a failure occurs in the first storage unit among three or more storage units of the storage unit and the first storage unit is initialized or replaced. The predetermined condition is that the parity or data obtained from the data or the parity recorded in the storage means other than the first storage means is recorded in the first storage means and restored, and the processing time is a predetermined unit time. Alternately, the restoration command and the first subcommand and the second subcommand, or the restoration command and the first command group and the second command group alternately, or the restoration command and the first command Each of the host computers connected to the storage means other than the first storage means while restoring the first storage means to process the subcommands and the second command group alternately. The arithmetic processing can be continued for a period of time that can be accessed continuously for a predetermined period of time, so that the processing performance of each host computer is averaged and the maximum response time is improved while improving the stability of the entire system. And a minimum throughput is guaranteed.

Further, the storage control system according to the present invention provides a storage control system in which a failure occurs in a first storage unit among three or more storage units of the storage unit and the first storage unit is initialized or replaced. The predetermined condition is that the parity or data obtained from the data or parity recorded in the storage means other than the first storage means is recorded in the first storage means and restored, and the processing time is a predetermined unit time. A recovery READ command for reading data or parity recorded in storage means other than the first storage means of the recovery command that is a parity command or a parity or data based on a read result by the READ command is recorded in the first storage means. WRITE command for recovery and a first subcommand or a second subcommand, or a plurality of first commands constituting a first command group READ command for parity generation, parity generation of a plurality of second commands constituting a command or a second command group, or a plurality of second commands constituting a first subcommand or a second command group READ command and WRITE command other than for recovery, and READ command for recovery and RE for parity generation.
In order to process the AD command, the READ command other than for parity generation, the recovery WRITE command, and the WRITE command in order, it is connected to storage means other than the first storage means while restoring the first storage means. Each host computer
Periodically, the arithmetic processing can be continued during a predetermined continuous access time, so that the processing performance of each host computer is averaged while improving the stability of the entire system, and the maximum response time and Minimum throughput is guaranteed.

Further, in the storage control system according to the present invention, the storage means has a first storage means and a second storage means, and the first and second storage means store the first subcommand or the second storage means. A second subcommand, or a plurality of first commands constituting a first command group or a plurality of second commands constituting a second command group, or a first subcommand or a second command group Since the data based on the READ command for parity generation, the READ command other than for parity generation, and the WRITE command included in the plurality of second commands, and the same data are recorded in the two storage units, If one storage unit fails, another storage unit can be substituted, and the reliability of the entire system is improved.

Further, the storage control system according to the present invention, when a failure occurs in the first storage unit of the two storage units included in the storage unit and the first storage unit is initialized or replaced, The condition is that the data recorded in the second storage means is copied to the first storage means and restored, the restoration command whose processing time is a predetermined unit time, the first subcommand, and the second Alternately processing a subcommand, or alternately, a restoration command and a first command group and a second command group, or alternately processing a restoration command and a first subcommand and a second command group. Therefore, while restoring the first storage means, each host computer connected to the second storage means periodically
Since the arithmetic processing can be continued during a predetermined continuous access time, the processing capacity of each host computer is averaged while improving the stability of the entire system,
Maximum response time and minimum throughput are guaranteed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a storage control system according to a first embodiment.

FIG. 2 is a control unit 21 of the storage control system according to the first embodiment.
FIG.

FIG. 3 is a conceptual diagram illustrating a command receiving unit 44 of the storage control system according to the first embodiment.

FIG. 4 is a conceptual diagram illustrating a command conversion unit of the storage control system according to the first embodiment;

FIG. 5 is a conceptual diagram showing a command processing procedure by the storage control system of the first embodiment and a command processing procedure by a conventional storage control system.

FIG. 6 is a conceptual diagram illustrating a processing time of a command processing by the storage control system according to the first embodiment and a processing time of a command by the conventional storage control system.

FIG. 7 is a configuration diagram of a storage control system according to a second embodiment.

FIG. 8 is a conceptual diagram illustrating a storage control system according to a second embodiment.

FIG. 9 is a conceptual diagram illustrating a command conversion unit of the storage control system according to the second embodiment.

FIG. 10 is a block diagram showing a storage control system capable of switching from a normal operation mode to a degenerate operation mode according to the third embodiment.

FIG. 11 is a conceptual diagram illustrating switching of an operation mode of a storage control system according to a third embodiment.

FIG. 12 is a block diagram of a storage control system for restoring from a reduced operation mode to a normal operation mode according to the fourth embodiment.

FIG. 13 is a conceptual diagram illustrating a command conversion unit of the storage control system according to the fourth embodiment.

FIG. 14 is a conceptual diagram showing a processing order based on a command output from a host computer 22 to 23 and a data recovery processing based on a command output from a virtual host 111.

FIG. 15 is a conceptual diagram showing a processing order based on a command output from the host computers 22 to 23 and a data recovery processing based on a command output from the virtual host 111, which are different from those in FIG.

FIG. 16 is a block diagram of a storage control system for returning from a degraded operation mode to a normal operation mode according to the sixth embodiment.

FIG. 17 is a conceptual diagram showing the processing order of processing based on commands output from host computers 70 to 71 and data recovery processing based on commands output from virtual hosts 131.

FIG. 18 is a configuration diagram of a conventional storage control system.

[Explanation of symbols]

10 to 11 storage disk unit, 12 disk connection unit,
13 shared memory, 14 to 15 disk control unit, 16
External storage device, 17 to 19 host computer, 20 external storage device, 21 control unit, 22 to 23 host computer, 24 to 28 disk device, 29 to 33 SCSI bus, 34 to 35 Fiber Channel interface, 36
RAID group, 40 reception queue, 41 estimated time calculation means, 42 grouping means, 43 storage queue, 4
4 command receiving unit, 45 command / batch means, 4
6 storage queue, 47 command / batch unit, 48 command conversion unit, 49 command conversion unit, 50 command transmission unit, 51 command issue queue, 52 command processing unit, 60 command group, 61 parity generation command group, 62 READ command group , 63 WRITE command group, 70-71 host computer, 72 control unit, 73-
74 Fiber Channel interface, 75-76 disk device, 77-78 SCSI bus, 80 RAID group, 81 external storage device, 90 command group, 100
I / O processing unit, 101 end processing unit, 102 operation switching means, 103 conversion unit (0), 104 conversion unit (1), 1
10 recovery instruction means, 111 virtual host, 120 command group, 121 recovery processing READ command group, 122
WRITE command group for recovery processing, 130 recovery instruction means, 131 virtual host.

Claims (10)

[Claims] A first host computer to which a first command is output; a second host computer to which a second command is output; a first host computer connected to the first host computer; A first processing time calculating means for calculating a first processing time required for processing the first command based on the second command connected to the second host computer and based on the second command A second processing time calculating means for calculating a second processing time required for the processing, connected to the first processing time calculating means, based on the first processing time and a predetermined unit time, the second processing time A first command grouping unit that divides one command into first subcommands and outputs the divided command, and a second command processing unit that is connected to the second processing time calculation unit and requires the second processing time for the processing. Command A second command grouping unit that divides and outputs the second subcommand based on the predetermined unit time, and is connected to the first and second command grouping units, and is connected to the first and second subcommands. A storage control system comprising: storage means for processing a command based on a predetermined condition. 2. A first host computer to which a plurality of first commands are output, a second host computer to which a plurality of second commands are output, and wherein the first host computer is connected to the first host computer, A first processing time calculating means for calculating a first processing time required for processing each of the first commands based on each of the first commands, and each of the second commands connected to the second host computer; Second processing time calculating means for calculating a second processing time required for processing of each of the second commands based on the first processing time connected to the first processing time calculating means; The first command grouping means that collects a plurality of the first commands requiring the above, integrates and outputs a first command group based on a predetermined unit time, and is connected to the second processing time calculation means, Where A second command grouping unit that collects a plurality of the second commands that require the second processing time, integrates and outputs a second command group based on the predetermined unit time, A storage control system, comprising: storage means connected to a second command grouping means, wherein the first and second command groups are processed based on predetermined conditions. A first host computer to which a first command is output; a second host computer to which a plurality of second commands are output; and a first host computer connected to the first host computer, A first processing time calculating means for calculating a first processing time required for processing the first command based on the first command, and a first processing time calculating means connected to the second host computer, and based on each of the second commands, A second processing time calculating means for calculating a second processing time required for processing each of the second commands, and connected to the first processing time calculating means, wherein the first processing time and a predetermined unit time A first command grouping unit that divides the first command into first subcommands and outputs the first command, and is connected to the second processing time calculation unit, and performs the second processing time in the processing. Above A plurality of commands, and a second command grouping means for integrating and outputting a second command group based on the predetermined unit time, and connected to the first and second command grouping means, A storage control system, comprising: storage means for processing the first subcommand and the second command group based on a predetermined condition. 4. The predetermined condition includes a plurality of first commands or a plurality of first commands included in the first subcommand or the second subcommand, or a plurality of first commands forming the first command group. READ command for parity generation, READ command for non-parity generation, and WRIT included in the second command or included in a plurality of second commands constituting the first subcommand or the second command group
E command is a READ command for parity generation,
READ command other than for parity generation above, WRITE above
In addition to the processing in the order of commands, the processing based on the READ command other than for the parity generation is performed in parallel with the parity calculation processing based on the READ command for the parity generation. Claim 1
3. The storage control system according to any one of 3. 5. The predetermined condition is that the first subcommand and the second subcommand are alternately set, the first command group and the second command group are alternately set, or the first subcommand and the second subcommand are set differently. The storage control system according to claim 1, wherein the storage control system alternately processes the second command group. 6. The storage means has three or more disk devices, and stores a first subcommand or a second subcommand or a first subcommand in a first disk device among the three or more disk devices. The parity of data based on a command group or a second command group is recorded.
3. The storage control system according to any one of 3. 7. When a failure occurs in a first disk device among three or more disk devices included in the storage means and the first disk device is initialized or replaced, a predetermined condition is determined by the first condition. A parity or data obtained from data or parity recorded on a disk device other than the one disk device is recorded and restored on the first disk device, and a recovery command whose processing time is a predetermined unit time is provided. The first subcommand and the second subcommand alternately, or the restoration command and the first command group and the second command group alternately, or the restoration command and the first subcommand and 7. The storage control system according to claim 6, wherein the second command group and the second command group are alternately processed. 8. When a failure occurs in a first disk device among three or more disk devices included in a storage means and the first disk device is initialized or replaced, a predetermined condition is set as the first condition. Parity or data obtained from data or parity recorded on disk devices other than one disk device is recorded and restored on the first disk device, and a recovery command whose processing time is a predetermined unit time is issued. A recovery READ command for reading data or parity recorded on a disk device other than the first disk device, and a recovery READ for recording parity or data based on the read result of the READ command in the first disk device. WRITE command and first subcommand or second subcommand or first command group Parity generation of a plurality of first commands or a plurality of second commands constituting a second command group, or a first subcommand or a plurality of second commands constituting a second command group. For
READ command, READ command other than for parity generation,
And a WRITE command are processed in the order of a recovery READ command and a READ command for generating the parity, a READ command other than for generating the parity, a WRITE command for recovery, and the WRITE command. The storage control system according to claim 6. 9. The storage means has a first disk device and a second disk device, and stores a first subcommand or a second subcommand or a first subcommand in the first and second disk devices. A plurality of first commands or a plurality of second commands that constitute a second command group, or a first subcommand or a plurality of second commands that constitute a second command group 4. The storage control system according to claim 1, wherein data based on a READ command for generating parity, a READ command other than for generating parity, and a WRITE command are recorded. 10. When a failure occurs in a first disk device among two disk devices included in a storage means and the first disk device is initialized or replaced, a predetermined condition is determined by the second disk device. The data recorded on the disk device is copied to the first disk device and restored, and the restoration command whose processing time is a predetermined unit time, the first subcommand and the second subcommand are alternately performed. Or alternately processing the restoration command and the first command group and the second command group, or alternately processing the restoration command and the first subcommand and the second command group. The storage control system according to claim 9, wherein: