JPH05204819A - Exclusive processing system - Google Patents

Abstract

PURPOSE:To release a low-order device from being used by other host devices and to effectively utilize a computer resource in a system wherein plural host devices use the low-order device exclusively even if the fault occurs to the host device while the host device uses the low-order device. CONSTITUTION:Other-system seed time counting devices a13 and b33 count the elapsed time once seed bits using a magnetic disk device a60 are stored from 1st and 2nd computers a10 and b30. Diagnostic processors a14 and b34 diagnose their faults and can make a mutual communication; when the seed bits are sent from a 1st computer a10 to the magnetic disk a60, the seed time counting device b33 of the other system starts the operation. When the counted time reaches a predetermined time, the diagnostic processors communicate with each other and sends the diagnostic result of the 1st computer a10. If the diagnostic result indicates the occurrence of a predetermined fault, the seed bits are forcibly reset.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exclusive processing system,
In particular, it relates to an exclusive processing method in which a plurality of upper devices exclusively control a common lower device.

[0002]

2. Description of the Related Art A conventional exclusive processing system will be described with reference to the drawings.

FIG. 7 is a block diagram of a conventional data processing system in which two systems of computers share one magnetic disk device.

In FIG. 7, in a system in which one magnetic disk device b90 is shared by two computers, a first computer c70 and a second computer d80, the first computer c70 and the second computer d80 are respectively The higher-level seeds control devices c71, d81 connected to the magnetic disk device 90 by the data lines c75 and d85, and incorporated in the first computer c70 and the second computer d80, respectively, are the seeds reporting lines c72, d82, Seeds set line c73,
d83 and the lower seeds controller b9 built in the magnetic disk device b90 by the seeds reset lines c74 and d84.
It is connected to 1.

In the conventional exclusive processing method, the seeds can be reset only by the host device in which the seeds are set.

As an example, a case of transferring data from the first computer c70 to the magnetic disk device b90 will be described.

An upper seeds controller c71 built in the first computer c70 requests a seeds to a lower seeds controller b91 built in a magnetic disk device b90 by using a seeds set line c73.

When the seeds are accepted, the lower seeds controller b91 sets the seeds reporting line c72 to "1" and reports to the upper seeds controller c71 that the seeds have been accepted.

As a result, the first computer c70
Recognizes that the seeds have been accepted, and starts data transfer to the magnetic disk device b90 using the data line c75.

Here, during the data transfer of the first computer c70, the upper seed control device d81 built in the second computer d80 is connected to the lower seed control device b91 built in the magnetic disk device b90 by the seed set line. When the seeds are requested using d83, the lower seeds controller b91 rejects the seeds request from the second computer b80 by keeping the seeds reporting line d82 at "0".

As a result, the second computer b80
Recognizes that the seeds have not been accepted, and enters a waiting state while issuing a seeds request using the seeds set line d83 until the seeds are accepted. Or
Perform other processing.

When the data transfer of the first computer c70 is completed, the higher-level seeds controller c71 built in the first computer c70 requests the seeds reset by using the seeds set line c74.

The lower seeds control device b91 receives the request for the seeds reset from the upper seeds control device c71 and sets the seeds reporting line c72 to "0".

Since the seeds from the upper seeds controller c71 are reset, the upper seeds controller d81
The seeds request is received and the seeds reporting line d82 is set to "1".

As a result, the second computer d80
Enables data transfer with the magnetic disk device b90.

[0016]

As described above, in the conventional exclusive processing system, as an example, the first computer c7 is used.
0 stops the operation due to some abnormality while seeding the magnetic disk device b90, the magnetic disk device b9
There is a drawback in that 0 may remain seeded to the first computer c70 and the normally operating second computer d80 may disable the magnetic disk device b90.

An object of the present invention is to add another system seeds time measuring device and a seeds forced resetting device to a computer,
Enables communication of error information between diagnostic processors,
In the case of a device configuration in which a plurality of computers share a plurality of magnetic disk devices, when one computer continues to seed the magnetic disk devices, another computer
Based on the information from the diagnostic processor of the computer that keeps seeding, it is judged whether there is an abnormality, and if it is judged to be abnormal, the seeds of the magnetic disk device are removed by forced seeds reset to eliminate the above drawbacks. Resolved
It means that the magnetic disk device becomes inaccessible because it is still seeded, or when you have to leave the magnetic disk device seeded for a long time such as when transferring long data, you can inadvertently reset the seeds from another system. The purpose is to provide an exclusive processing method that can effectively utilize computer resources.

[0018]

The exclusive processing method according to the first aspect of the present invention is an exclusive processing method in which a lower device shared by a plurality of upper devices is exclusively used. (B) storage means for storing a seed bit for requesting use of the lower device from the upper device in the lower device for each of a plurality of upper devices, and a seed stored in the storage device. Notifying means for notifying higher-order devices other than the higher-order device corresponding to the bit that the lower-order device is in use, and forcing the seeds bit stored in the storing means by the reset signal from the reset-signal generating means of the higher-order device. (C) when the reset signal generating means receives a notification from the notification means that the lower device is in use, the use time is measured, and When use time exceeds a time determined because Ji preliminary, and generates a reset signal.

The exclusive processing method according to the second aspect of the present invention is the exclusive processing method according to the first aspect of the present invention, wherein each host device has a diagnostic processor capable of communicating with each other for diagnosing its own fault, and the reset signal generating means. When the notification means notifies that the lower device is in use, the operating time is measured, and if the used time exceeds the predetermined time, the diagnostic processor of the upper device that generates the seed bit is generated. It has a function of obtaining failure information from the device and generating a reset signal if there is a failure.

The exclusive processing method of the third invention is the exclusive processing method of the second invention, wherein a reset signal is generated in the reset signal generating means if the failure is a predetermined failure. It has a function of not generating a reset signal unless it is a predetermined failure.

[0021]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram of a data processing system in which two systems of computers according to an embodiment of the present invention share one magnetic disk device.

In FIG. 1, the first computer a10 and the second computer b30 of the data processing system of this embodiment are connected to the magnetic disk device a60 by data lines a20 and b40, respectively. And the higher-level seeds control devices a11 and b31 built in the second computer b30 are the seeds reporting lines a15 and b35, the seeds setting lines a16 and b36, respectively.
A seeds forced reset device a12 connected to the lower seeds controller a61 built in the magnetic disk controller a60 by the seeds reset lines a17, b37 and built in the first computer a10 and the second computer b30.
b32 and the other system seeds time measuring devices a13 and b33 are connected to the lower control device a61 by the seeds forced reset lines a18 and b38 and the other system seeds reporting lines a19 and b39, respectively, and further, the first computer a10 and the first computer a10. Diagnostic processor a1 built in the second computer b30
4, b34 are connected to each other by a diagnostic processor communication line 50.

Next, the operation of the exclusive processing method of this embodiment will be described.

As an example, a case where the first computer a10 is stopped during data transfer from the first computer a10 to the magnetic disk device a60 will be described.

The upper seeds control device a11 built in the first computer a10 requests the lower seeds control device a61 built in the magnetic disk device a60 to use the seeds set line a16.

When the seeds are accepted, the lower seeds controller a61 reports the acceptance of the seeds to the upper seeds controller a11 by setting the seeds reporting line a15 to "1". At the same time, the second computer b30 is notified that the first computer a10 has sheathed the magnetic disk device a60 by using the other system seeds reporting line a19.

The first computer a10 recognizes that the seeds have been accepted, and starts data transfer using the magnetic disk device a60 and the data line a20. Here, the first computer a10 is the magnetic disk device a6.
If it stops due to some abnormality while seeding 0,
An abnormal condition that the first computer a10 keeps seeding the magnetic disk device a60 for a certain period of time or longer is detected by the other system seeds time measuring device b33 incorporated in the second computer b30, and is notified to the diagnostic processor b34.

The diagnostic processor b34 uses the inter-diagnostic processor communication line 50 to instruct the diagnostic processor a14 built in the first computer a10 to send the error information and status of the first computer a40, The diagnostic processor a14 is the first computer a.
The error information and status of 40 are sent to the diagnostic processor b34 through the inter-diagnostic processor communication line 50.

The diagnostic processor b34 analyzes the sent error information and status, and only when the seeds of the first computer a10 cannot be melted due to a failure, the seeds compulsory in the second computer b30 are forced. The reset circuit b32 is a seeds forced reset line b6.
8, the lower seeds control circuit a61 built in the magnetic disk device a60 is instructed to reset the seeds. This instruction causes the lower seeds control circuit a61 to reset the seeds of the first computer a10. FIG. 2 is a diagram showing an example of a specific circuit configuration of the lower seeds control circuit incorporated in the exclusive control system lower controller a61 of the present embodiment.

In FIG. 2, this device has a NOT gate 1
00, 101, 102, 103, 104, two-input AND
Gate 105, three-input AND gates 106, 107, 1
08, two-input OR gates 109 and 110 and D-type flip-flops 111 and 112, and clock 1
20, a seeds set line a16, a seeds reset line a17 from the first computer a10 of FIG. 1 and a seeds forced reset line a18 for resetting the seeds set by the second computer b30, a second computer b of FIG.
Seeds set line b36 and seeds reset line b from 30
37 and seven or more seeds forced reset lines b38 for resetting the seeds set by the first computer a10 are input to this seeds control circuit. Further, the seeds report line a18 and the other system seeds report line a19 are output to the first computer a10, and the seeds report line b38 and the other system seeds report line b39 are output to the second computer b30.

FIG. 3, FIG. 4, and FIG. 5 are time charts showing an example of the operation of the lower seeds control circuit, and the operation of the circuit will be described below with reference to this time chart.

However, the input signal is assumed to be synchronized with the clock 120. FIG. 3 is a time chart showing an example of the operation of the lower seeds control circuit of FIG.

Here, FIG. 3 specifically shows conditions for setting and resetting the seed report line a15 and the other system seed report line b39 to the first computer a10 of FIG.

In FIG. 3, first, the seeds set line a16 from the first computer a10 is set to "1", so that the seeds report line a15 and the other system seeds report line b3.
9 is set to "1". After that, the seed set line b36 from the second computer b30 is "1", but the seed report line a15 and the other system seed report line b3.
Second computer b because 9 is "1"
Seed reporting line b38 to 30 and other system reporting line a1
9 remains “0”. After that, the seeds report line a18 and the other system seeds report line b39 are reset to "0" by the "1" of the seeds reset line a17 from the first computer a10. Then, again, the seed set line a16 from the first computer a10 is "1".
Then, the seeds report line a18 and the combined seeds report line b39 are set to "1", and then the seeds forced reset line b38 from the second computer b30 is set to "1". The seed reporting line a18 and the other system reporting line b39 to one computer b30 are reset to "0". FIG. 4 is a time chart showing another example of the operation of the lower seeds control circuit of FIG.

Here, FIG. 4 specifically shows the conditions for setting and resetting the seed report line b38 and the other system seed report line a19 to the second computer b30 of FIG.

In FIG. 4, first, the seeds set line b36 from the second computer b30 becomes "1", so that the seeds report line b38 and the other system seeds report line a1.
9 is set to "1". After that, the seeds set line a16 from the first computer a10 is "1", but the seeds reporting line b to the second computer b30 is
Since 38 is "1", the first computer a
Seed reporting line a15 to 10 and other system seeds reporting line b3
9 remains “0”. After that, the seeds report line b38 and the other system seeds report line a19 are reset to "0" by "1" of the seeds reset line b37 from the second computer b30. Then, again, the seed set line b36 from the second computer b30 is "1".
Then, the seeds report line b35 and the other system seeds report line a19 to the second computer b30 are set to "1", and then the seeds forced reset line a18 from the first computer a10 is set to "1". By becoming
The seed report line b35 and the other system seed report line a19 to the second computer b30 are reset to "0". FIG. 5 is a time chart showing still another example of the operation of the lower seeds control circuit of FIG.

Here, specifically, FIG. 5 shows a case where the sheath set line a16 from the first computer a10 and the sheath set line b36 from the second computer b30 in FIG. 1 simultaneously become "1". The set conditions of the seeds reporting line a15, the seeds reporting line b35, the others seeds reporting line a19, and the others seeds reporting line b39 are shown.

In FIG. 5, when the sheath set line a16 and the sheath set line b36 simultaneously become "1",
The AND gate 107 is set to "0" by the NOT gate 102 of the second computer b30.
Seed report line b35 to other seeds report line a19
Remains reset to "0" and preferentially sets the seeds reporting line a15 to the first computer a10 and the seeds reporting line b39 of the other system to "1".

As a result, exclusive control is performed when the seeds are simultaneously set.

FIG. 6 is a flowchart of the processing of the diagnostic processor from the detection of an abnormality in the other system seeds time measuring device a13 to the output of the seeds forced reset.

The case where the first computer a10 forcibly resets the seeds of the second computer b30 will be described below as an example.

In FIG. 6, the first computer a10
When the other system seeds time measuring device a13 incorporated in the computer detects an abnormality (step 131), the second computer b
Request a status report from the diagnostic processor b34 of 30 (step 132).

Next, the information sent from the diagnostic processor b34 is analyzed by the diagnostic processor a14 built in the first computer a10 (step 133).

At this time, it is judged whether or not the seeds forced reset is necessary (step 134), and if necessary, the seeds forced reset is executed (step 135), and the process is terminated.

[0046]

As described above, according to the exclusive processing method of the present invention, the other system seeds time measuring device and the seeds forced resetting device are added to the computer, and the error information is communicated between the diagnostic processors. If the computer is a device configuration that shares multiple magnetic disk devices,
When one computer keeps seeing the magnetic disk drive, another computer judges whether it is abnormal based on the information from the diagnostic processor of the computer that keeps seeing the disk, and it is determined to be abnormal. In that case, by removing the seeds of the magnetic disk device by the forced seeds reset, the magnetic disk device becomes inaccessible because it remains seeded, or there is no choice but to keep the magnetic disk device seeded for a long time such as when transferring long data. Sometimes the seeds will not be inadvertently reset by other systems, and there is an effect that computer resources can be effectively utilized.

[Brief description of drawings]

FIG. 1 is a block diagram of a data processing system in which two systems of computers according to an embodiment of the present invention share one magnetic disk device.

FIG. 2 is a lower-level control device a61 of the exclusive processing method according to the present embodiment.
FIG. 3 is a diagram showing an example of a specific circuit configuration of a lower seeds control circuit incorporated in the HDD.

FIG. 3 is a time chart showing an example of the operation of the lower seeds control circuit of FIG.

FIG. 4 is a time chart showing another example of the operation of the lower seeds control circuit of FIG.

5 is a time chart showing still another example of the operation of the lower seeds control circuit of FIG.

FIG. 6 is a flowchart of a process of a diagnostic processor from when an abnormality is detected by the other system seeds time measuring device a13 until a seeds forced reset is output.

FIG. 7 is a block diagram of a data processing system in which two systems of computers of a conventional example share one magnetic disk device.

[Explanation of symbols]

10 first computer a 11 upper-level seeds control device a 12 seeds forced reset device a 13 other system seeds time measurement device a 14 diagnostic processor 15 seeds reporting line a 16 seeds set line a 17 seeds reset line a 18 seeds forced reset line a 19 Other system seeds reporting line a 20 Data line a 30 Second computer b 31 Upper seeds control device b 32 Seeds forced reset device b 33 Other system seeds time measuring device b 34 Diagnostic processor 35 Seeds reporting line b 36 Seeds set line b 37 seeds reset line b 38 seeds forced reset line b 39 other system seeds reporting line 40 data line b 50 diagnostic processor communication line 60 magnetic disk device a 61 lower seeds controller a 70 first computer c 71 upper seeds controller c 72 Seas Report Line c 73 Set line c 74 seed reset line c 75 data line c 80 second computer d 81 upper seed control device d 82 seed report line d 83 seed set line d 84 seed reset line d 85 data line d 90 magnetic disk unit b 91 lower Seeds controller b 100, 101, 102, 103, 104 NOT gate 105 Two-input AND gate 106, 107, 108 Three-input AND gate 109, 110 Two-input OR gate 111, 112 D-type flip-flop 120 Clock

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location G06F 11/22 330 D 8323-5B 15/16 470 R 9190-5L

Claims (3)

[Claims] 1. An exclusive processing method in which a lower device shared by a plurality of upper devices is exclusively used, (A) the upper device has a reset signal generating means for generating a reset signal, and (B) Storing means for storing, in each of the plurality of upper devices, a seed bit requesting the lower device to use the lower device from the upper device, and an upper device other than the upper device corresponding to the seed bits stored in the storing device. And a resetting means for forcibly resetting the seeds bit stored in the storing means in response to a reset signal from the reset signal generating means of the higher-level device. (C) when the reset signal generating means receives a notification from the notification means that the lower-order device is in use, it measures the usage time, When use time exceeds a time determined because Ji pre exclusive processing method characterized by generating the reset signal. 2. The exclusive processing method according to claim 1,
Each of the upper devices has a diagnostic processor capable of communicating with each other for diagnosing its own failure, and when the reset signal generating means is notified by the notifying means that the lower device is in use, the use time is reduced. When the measurement is performed and the usage time exceeds the predetermined time, it has a function of obtaining failure information from the diagnostic processor of the higher-level device that generated the seed bit, and if it is a failure, generating a reset signal. An exclusive processing method characterized in that 3. The exclusive processing method according to claim 2,
The reset signal generating means has a function of generating a reset signal if the failure is a predetermined failure and not generating a reset signal unless the failure is a predetermined failure. Exclusive processing method.