JP4807172B2 - Disk array device, patrol diagnosis method, and patrol diagnosis control program - Google Patents

Description

  The present invention relates to a disk array device including a plurality of hard disk devices, and more particularly to a technique for performing a patrol diagnosis of a hard disk device.

  In a disk array device that includes a plurality of hard disk devices (hereinafter referred to as HDDs) and is generally called a RAID (Redundant Array of Independent Disks) device, an abnormality in the HDD is detected when data is accessed from a host device such as a server. In order to avoid this, an abnormality of an operating HDD is detected in advance at an early stage, and a patrol diagnosis is a common method.

  Patrol diagnosis, for example, secures a diagnosis area in the HDD data area, and periodically performs write / read access to the diagnosis area, so that abnormalities such as HDD medium errors and write defects can be detected at an early stage. It is to detect.

  The configuration of a disk array device is generally divided into two parts: a device enclosure unit (hereinafter referred to as “DE”) having a plurality of HDDs, and a controller enclosure unit (hereinafter referred to as “CE”) that governs overall control related to servers and DEs. The device adapter unit (hereinafter referred to as DA) in the CE that performs user data write access and read access to the HDD in response to a request from the server It is implemented by issuing commands for patrol diagnosis.

  Conventionally, the magnetic disk controller corresponding to CE detects means for generating patrol diagnosis start timing, means for issuing a patrol diagnosis instruction to the DE, and detects an abnormality when accessing the HDD in the DE based on the instruction. Then, the magnetic disk controller starts a patrol diagnosis at regular intervals, issues a patrol diagnosis command (patrol read) to the DE and patrols the HDD. When a diagnosis is performed and an abnormality of the HDD is detected as a result of the diagnosis, an abnormality report to that effect is sent to the host device to enable early detection of the abnormality of the HDD (for example, see Patent Document 1). ). Note that each means in this case corresponds to a part of DA.

  As an example of specific processing for the patrol diagnosis between the CE and the DE, first, patrol diagnosis conditions (diagnosis type, LBA: Logical Block Address, number of diagnosis execution blocks, patrol interval time, etc.) preset in the CE ), The DA in the CE starts the patrol diagnosis process.

  The DA that has started the diagnosis process sends a patrol diagnosis command to one HDD in the DE, and receives a response of the diagnosis result from the HDD that has performed the patrol diagnosis. If the response is a normal response with no abnormality in the HDD, the patrol diagnosis is performed for all HDDs in the DE in operation by sequentially repeating the same patrol diagnosis for other HDDs. Let it be implemented.

If there is an abnormal response from the HDD in the middle of the diagnosis, the DA recognizes the abnormality of the HDD and reports an error to the CE, so that the CE determines the predetermined HDD according to the content of the recognized abnormal state. Detach and perform recovery processing. After the DA reports an error to the CE, a series of processes such as continuing the patrol diagnosis process for all HDDs by moving to the next other HDD, etc. are performed for the patrol diagnosis. This is an example of a well-known process between the terminal and the DE.
JP-A-5-158628

  However, in the conventional technology, the DA performs the patrol diagnosis for each HDD while issuing the user data access to the HDD in the DE in response to a request from the host device, that is, issues a patrol diagnosis command. Since the process of judging the diagnosis response and detecting the abnormality of the HDD is also executed in parallel, the DA is burdened at the time of executing the patrol diagnosis, and the user data to the HDD by the request from the host device which is the original function Access is hindered, and there is a problem that access performance to user data is degraded.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a disk array device, a patrol diagnosis method, and a control program that can reduce a decrease in user data access performance associated with execution of a patrol diagnosis of the disk array device.

  A disk array device according to a first aspect of the present invention includes a disk array storage unit including a plurality of hard disk devices accessed from a host device (such as a server), a disk array control unit that controls the host device and the disk array storage unit, and Are connected to each other via an internal interface (for example, a Fiber Channel interface or a Serial Attached SCSI interface) and have a patrol diagnosis function for periodically diagnosing the normality of the hard disk device. In the array device, the disk array storage unit includes a patrol diagnosis starting means for generating a patrol diagnosis start instruction based on the held patrol diagnosis condition, and the hard disk based on the patrol diagnosis condition based on the start instruction. Each device A diagnostic command issuing means for sequentially issuing a predetermined diagnostic execution instruction; a diagnostic response receiving means for receiving a predetermined diagnostic result response from execution of the diagnostic execution instruction from the hard disk device; and determining the received diagnostic result response And a diagnostic abnormality detection means for detecting an abnormality of the hard disk device.

  The disk array device according to a second aspect is the disk array device according to the first aspect, wherein the disk array control unit notifies the patrol diagnosis start unit of the patrol diagnosis condition preset in the disk array control unit. The patrol diagnosis starting means holds the patrol diagnosis condition notified from the diagnosis condition notifying means.

  According to the first aspect, the disk array storage unit issues a start instruction that is generated based on the held patrol diagnosis condition and issues a diagnosis execution instruction to each hard disk device sequentially based on the patrol diagnosis condition. Since the abnormality of the hard disk device can be detected by judging the diagnosis result response by executing the diagnosis execution instruction, once the patrol diagnosis condition is held in the disk array storage unit, the disk array storage is performed based on the held patrol diagnosis condition. Patrol diagnosis can be executed only by the department.

  According to the second aspect, since the disk array storage unit can hold the patrol diagnosis condition notified from the disk array control unit, the patrol diagnosis condition for the patrol diagnosis executed by the disk array storage unit is appropriately changed. This can be reflected in the subsequent execution of the patrol diagnosis.

  According to the present invention, the patrol diagnosis of each HDD can be executed in the disk array storage unit independently of the disk array control unit based on the patrol diagnosis condition held in the disk array storage unit. It is possible to reduce a decrease in user data access performance due to diagnosis execution.

(Example 1)
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a disk array device according to a first embodiment of the present invention. FIG. 1 is a diagram showing the configuration of the disk array device, but does not cover the components necessary for functioning as a disk array device, and is limited to the components related to the present invention for the sake of explanation. It is a block diagram.

  In FIG. 1, a disk array device 2 connected to a host device such as a server 1 has a disk array storage unit 5 (corresponding to a device enclosure unit) having a plurality of HDDs 3a to 3n, and a server 1 and a disk array storage unit 5. It has a disk array control unit 4 (corresponding to a controller enclosure unit) that performs control, and connects each other and each of the HDDs 3a to 3n through a predetermined Fiber Channel (hereinafter referred to as FC) interface 6a.

  The disk array storage unit 5 includes a well-known SCSI Enclosure Service (hereinafter referred to as SES) device 30a that monitors the state (internal temperature, HDD use voltage, etc.) in the disk array storage unit 5, and the SES device 30a The patrol diagnosis starting unit 31 that holds patrol diagnosis conditions notified from the disk array control unit 4 via the FC interface 6a and generates a patrol diagnosis start instruction based on the held patrol diagnosis conditions is provided. .

  The patrol diagnosis conditions stored in the patrol diagnosis starting unit 31 are not limited to those notified from the disk array control unit 4, but are directly input to the patrol diagnosis starting unit 31 from any one not shown in the disk array storage unit 5 by manual input. It may be set, or may be set in advance by fixed setting at the time of shipment setting or maintenance setting.

  The generation of the start instruction in the patrol diagnosis starting unit 31 is, for example, a diagnosis start which is one of the patrol diagnosis conditions (may be a patrol diagnosis start command in each case independent of the patrol diagnosis conditions), or patrol This is based on a cycle based on a patrol interval time (hereinafter referred to as a diagnostic cycle time), which is another diagnostic condition, for example, a time monitoring using a diagnostic cycle timer (not shown).

  For convenience of explanation, it is assumed here that a start instruction is generated by the latter method. It goes without saying that the latter method reduces the load on the device adapter unit 20 because there is less communication between the device adapter unit 20 and the disk array storage unit 5 described later, and leads to improvement in the access performance of user data. .

  Note that the function of the patrol diagnosis activation unit 31 to hold the patrol diagnosis condition does not need to physically exist in the patrol diagnosis activation unit 31. For example, any information storage unit (HDD) provided in the disk array storage unit 5 Or a non-illustrated nonvolatile RAM). In that case, the patrol diagnosis starting unit 31 may receive the patrol diagnosis condition held in the information storage means indirectly by access using a command or the like.

  Further, the SES device 30a uses the start instruction generated by the patrol diagnosis starting unit 31 as a starting point, and sequentially determines each of the HDDs 3a to 3n via the FC interface 6a based on the patrol diagnosis conditions held in the patrol diagnosis starting unit 31. A diagnostic command issuing unit 32 that issues a diagnostic execution command is provided.

  In addition, the SES device 30a includes a diagnosis response receiving unit 33 that receives a predetermined diagnosis result response from the HDDs 3a to 3n via the FC interface 6a, with a diagnosis result obtained by executing the diagnosis execution command issued by the diagnosis command issuing unit 32. Diagnostic abnormality detection for detecting a diagnostic abnormality of the HDDs 3a to 3n by judging a diagnostic result accompanying the diagnostic result response received by the receiving unit 33 and reporting the detected diagnostic abnormality to the disk array control unit 4 via the FC interface 6a Part 34.

  The above-described patrol diagnosis starting unit 31, diagnostic command issuing unit 32, diagnostic response receiving unit 33, and diagnostic abnormality detecting unit 34 do not necessarily have to be provided in the SES device 30a. You may prepare for either.

  On the other hand, the disk array control unit 4 includes a device adapter unit 20 that accesses the disk array storage unit 5, and a processing control unit 10 that controls the server 1, the device adapter unit 20, and the like. The adapter unit 20 includes a device adapter control unit 21 that manages and controls the entire device adapter unit 20 based on exchanges with the processing control unit 10.

  The device adapter unit 20 further notifies a patrol diagnosis starting unit 31 of a patrol diagnosis condition preset in the disk array control unit 4 via the FC interface 6a in response to a command from the device adapter control unit 21. Unit 22 and a diagnostic abnormality receiving unit 23 that receives a diagnostic abnormality reported from the diagnostic abnormality detection unit 34 via the FC interface 6a and notifies the device adapter control unit 21 of the diagnostic abnormality.

  Note that the patrol diagnosis start command or the diagnosis start within the patrol diagnosis condition described above, which is based on the generation of the patrol diagnosis start instruction in the patrol diagnosis start unit 31 in the disk array storage unit 5, is performed by the disk array control unit 4 It may be generated based on a periodic timing trigger generated by providing a diagnostic activation timer (not shown) in any of them, and issued from the diagnostic condition notification unit 22. Needless to say, it may be generated by a command such as patrol diagnosis start from the server 1 without depending on the diagnosis start timer in the disk array control unit 4.

  The patrol diagnosis condition set in the disk array control unit 4 may be stored in either the processing control unit 10 or the device adapter unit 20, and further, the setting stored as the patrol diagnosis condition is set by manual input or Any setting such as command setting from the server 1 may be used.

  Exchange of communication information (commands, data, etc.) between the device adapter unit 20 and the SES device 30a and between the SES device 30a and the HDDs 3a to 3n through the FC interface 6a is a predetermined command in accordance with the FC interface 6a. The definition may be made based on the form or procedure. In particular, the diagnosis execution command issued to the HDDs 3a to 3n by the SES device 30a (here, the diagnosis command issuing unit 32) may be the same as the patrol diagnosis command issued by the conventional device adapter unit 20 to the HDDs 3a to 3n. .

  Also, communication information is exchanged between the device adapter unit 20 and the HDDs 3a to 3n through the FC interface 6a, and in particular, data access to the HDDs 3a to 3n based on a request from the server 1 (user data write access, read access, etc.) As for the exchange such as a response to it, the procedure by the predetermined command issued by the conventional device adapter unit 20 to the HDDs 3a to 3n and the response thereof may be the same.

  For convenience of explanation, the diagnosis area on the HDDs 3a to 3n where the patrol diagnosis is performed is a patrol diagnosis area separated from the user data area, and setting of an LBA (logical block address) which is one of the patrol diagnosis conditions. Sometimes considered. In such a separation mode, the access for user data from the device adapter unit 20 and the access for patrol diagnosis from the SES device 30a do not access the same area. There is no need to perform data saving and restoring operations, and it is easy to maintain the consistency of user data.

  Note that the exchange of communication information between the disk array control unit 4 and the disk array storage unit 5 relating to the patrol diagnosis described above is described as being performed by the device adapter unit 20 and the SES device 30a included in each via the FC interface 6a. However, as another method, for example, it may be performed via a well-known sideband interface (for example, Ethernet (registered trademark)) generally provided between the disk array control unit 4 and the disk array storage unit 5. I do not care.

  In this case, the processing control unit 10 in the disk array control unit 4 and a storage processing control unit (not shown) that controls the entire disk array storage unit 5 in the disk array storage unit 5 mutually communicate, for example, Ethernet (registered trademark). The communication between both parties is based on a predetermined command format and procedure conforming to Ethernet (registered trademark).

  Next, the operation of the first embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a flowchart for explaining the operation of the disk array device of the present invention.

  In FIG. 2, in the disk array control unit 4, the diagnostic condition notification unit 22 is preset in the disk array control unit 4 in response to a command from the device adapter control unit 21 when the disk array device 2 is turned on or restarted. The patrol diagnosis conditions are notified to the patrol diagnosis starting unit 31 in the SES device 30a through the FC interface 6a (S11).

  In the SES device 30a of the disk array storage unit 5, the patrol diagnosis starting unit 31 holds the notified patrol diagnosis condition (S21), and the diagnosis cycle timer started by the timer based on the diagnosis cycle time of the held patrol diagnosis condition is stored. It is monitored that the time reaches the diagnosis cycle time (for example, timer interruption occurs) (S22). If the monitoring confirms that the diagnosis cycle time has been reached (Yes determination), the patrol diagnosis starting unit 31 generates a start instruction for the patrol diagnosis (S23).

  The diagnosis command issuing unit 32 uses this start instruction as a trigger, and executes a predetermined diagnosis for any one of the HDDs 3a to 3n via the FC interface 6a based on the patrol diagnosis conditions held by the patrol diagnosis starting unit 31. An instruction is issued (S24). One HDD here is the first diagnosis target, and may be freely set according to the LBA, the HDD mounting position, or the like. In any case, it is sufficient that the HDDs to be diagnosed are sequentially selected and the patrol diagnosis of all the HDDs 3a to 3n can be performed. For convenience of explanation, it is assumed here that HDD3a, HDD3b,.

  In the HDDs 3a to 3n, the diagnosis target HDD 3a receives the diagnosis execution instruction issued from the SES device 30a (S31), and executes a predetermined patrol diagnosis for the diagnosis area in the HDD 3a based on the diagnosis execution instruction. (S32) The diagnosis result is reported to the SES device 30a through the FC interface 6a as a predetermined diagnosis result response (S33).

  The predetermined patrol diagnosis executed in the HDDs 3a to 3n is, for example, performing a write / read diagnosis in which diagnostic data is written in a diagnostic area designated by the LBA and then the diagnostic data is read. A medium error or write failure is detected from the result of the write / read diagnosis.

  In the SES device 30a of the disk array storage unit 5, the diagnostic response receiving unit 33 receives the diagnostic result response from the HDD 3a (S25), and the diagnostic abnormality detecting unit 34 determines whether or not the diagnostic result of the received diagnostic result response is normal. (S26).

  If it is determined in step S26 that the diagnosis result is abnormal (No determination), the diagnostic abnormality detection unit 34 recognizes that there is a diagnostic abnormality in the patrol diagnosis in the HDD 3a, and the diagnostic abnormality is detected by the FC interface 6a. And the process proceeds to step S28 described later (S27).

  In the disk array control unit 4, the diagnosis abnormality receiving unit 23 receives the diagnosis abnormality reported from the HDD 3a and notifies the device adapter control unit 21 (S12). The device adapter control unit 21 and the process control unit 10 that have been notified of the diagnosis abnormality execute a predetermined error process when a patrol diagnosis abnormality occurs (S13). As the error processing, for example, predetermined disconnection or recovery processing of the corresponding HDD is performed according to the content of the recognized diagnostic abnormality. Further, an error report to the server 1 is performed as necessary.

  On the other hand, if it is determined in step S26 that the diagnosis result is normal (Yes determination), it is next determined whether or not the patrol diagnosis for all HDDs 3a to 3n is completed in the diagnosis command issuing unit 32 (S28). . If it is determined in this determination that all of the HDDs 3a to 3n have not ended (No determination), the process returns to step S24, and any one of the HDDs for which patrol diagnosis has not been completed (here, HDD 3b). The above-described series of processing from step S24 to step S28 is repeated.

  When it is determined that the patrol diagnosis of all the HDDs 3a to 3n has been completed (Yes determination) by the determination again in step S28 after executing this series of processing, a series of the start instruction generated in step S23. The patrol diagnosis processing (first time) for the HDDs 3a to 3n is terminated.

  However, as shown by the process connection indicated by the symbol A in FIG. 2, when the new monitoring period time is confirmed (Yes determination) by the constant monitoring in step S22, the patrol is performed. The diagnosis starting unit 31 generates a start instruction for the patrol diagnosis again (second and subsequent times) (S23), and repeats a series of processes from the above step S24 to the above step S28. .

  If information for invalidating the patrol diagnosis or information for stopping the diagnosis cycle timer is added to the patrol diagnosis conditions and notified to the HDDs 3a to 3n, the patrol diagnosis after the invalidation or timer stop notification is performed. It goes without saying that the series of processes can be stopped by the end determination (Yes determination) in step S28.

  The operation has been described above with reference to the flowchart of FIG. 2, but the illustrated flowchart is an example, and the present invention is not limited thereto. For example, even if the order of the steps in FIG. 2 is changed, if the same processing result is obtained, the order may be changed for convenience.

  Next, another embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a block diagram showing the disk array device according to the second embodiment of the present invention. 3 is also a block diagram limited to the components related to the present invention for convenience of explanation, similarly to the contents shown in FIG.

  3, the disk array device 2 connected to the host device such as the server 1 includes a disk array storage unit 5 having a plurality of HDDs 3a to 3n, and a disk array control unit that controls the server 1 and the disk array storage unit 5. 4 and connected to each other via a predetermined Serial Attached SCSI (hereinafter referred to as SAS) interface 6b.

  The disk array storage unit 5 is connected between the disk array control unit 4 connected to the SAS interface 6b and the HDDs 3a to 3n connected to the SAS interfaces 6ba to 6bn. It has a known expander device (hereinafter referred to as an expander) 30b having the connection expandability.

  The expander 30b includes the patrol diagnosis starting unit 31, the diagnosis command issuing unit 32, the diagnosis response receiving unit 33, and the diagnosis abnormality detecting unit 34 described above with reference to FIG. The expander 30b further includes a well-known physical port (common name phy) 35 connected to the SAS interface 6b connection on the disk array controller 4 side and a physical port 36a similar to the SAS interfaces 6ba to 6bn connection on the HDDs 3a to 3n. ~ 36n. Note that the SAS interface 6b and the SAS interfaces 6ba to 6bn are both predetermined SAS interfaces.

  On the other hand, the disk array control unit 4 includes the device adapter unit 20 and the processing control unit 10 described above with reference to FIG. 1. Similarly, the device adapter unit 20 includes a device adapter control unit 21, a diagnosis condition notification unit 22, and A diagnosis abnormality receiving unit 23 is provided.

  FIG. 3 is basically the same as FIG. 1 except that the SAS interface 6b, 6ba to 6bn is substituted for the FC interface 6a shown in FIG. 1, and the expander 30b is substituted for the SES device 30a. Therefore, in the description of each part in FIG. 3, the FC interface 6a is placed in the SAS interface 6b, 6ba-6bn, and the SES device 30a is placed in the expander 30b in the description of each part in FIG. The description here is omitted because it can be replaced. However, a specific description related to the SAS interfaces 6b and 6ba to 6bn will be described below.

  The SAS interface 6b supports a well-known serial management protocol (hereinafter referred to as SMP) as a protocol for exchanging data between the disk array control unit 4 and the expander 30b. The disk array control unit 4 uses this SMP to acquire information such as the SAS address and phy-ID of the devices connected to the SAS interfaces 6b and 6ba to 6bn, and to give an operation instruction to the expander 30b. Do.

  When there is a data access request to a certain HDD (for example, HDD 3a) from the disk array control unit 4 based on a request from the server 1, the expander 30b is a physical port to which the corresponding HDD (HDD 3a) is connected. (Physical port 36a) is selected, and data for access is transmitted to the physical port (physical port 36a).

  Similarly, in the reverse direction, when there is a report request from a certain HDD (HDD 3a) to the disk array control unit 4, the report is made to the physical port (physical port 35) to which the disk array control unit 4 is connected. The data etc. are transmitted.

  Between the disk array control unit 4 (here, the device adapter unit 20) and the expander 30b, not only the original exchange related to the data access described above but also the exchange of commands and response notifications related to the patrol diagnosis are performed. Thus, the SMP has commands conforming to the SMP for patrol diagnosis condition setting and patrol diagnosis activation issued from the disk array control unit 4 to the expander 30b, and from the expander 30b to the disk array control unit 4. It has a response notification conforming to SMP for a diagnosis abnormality report to be issued.

  In addition, the expander 30b is not only set as a target device of the SMP, but is also a well-known device related to SMP in the expander 30b in order to enable access to the disk array control unit 4 led by the expander 30b. The corresponding setting is a setting that allows both the initiator device and the target device.

  The same is true for the operation of the second embodiment of the present invention. In the description with reference to the flowchart of FIG. 2 described above, the FC interface 6a is replaced with the SAS interfaces 6b and 6ba-6bn, and the SES device. Since it is only necessary to replace 30a with the expander 30b, the description of the operation is omitted here.

1 is a block diagram showing a disk array device according to a first embodiment of the present invention. Flowchart explaining the operation of the disk array device of the present invention A block diagram showing a disk array device according to a second embodiment of the present invention.

Explanation of symbols

1 server 2 disk array device 3a to 3n HDD
4 disk array control unit 5 disk array storage unit 6a FC interface 6b, 6ba-6bn SAS interface 10 processing control unit 20 device adapter unit 21 device adapter control unit 22 diagnostic condition notification unit 23 diagnostic abnormality reception unit 30a SES device 30b expander 31 Patrol diagnosis starting unit 32 Diagnostic command issuing unit 33 Diagnostic response receiving unit 34 Diagnostic abnormality detecting unit 35, 36a to 36n Physical port

Claims (4)

A Lud Isukuarei apparatus controls the multiple hard disk devices,
A diagnostic command issuing means for sequentially issuing a predetermined diagnostic execution command to each of the hard disk devices based on the held patrol diagnostic conditions;
Diagnostic response receiving means for receiving a predetermined diagnostic result response from execution of the diagnostic execution command from the hard disk device;
A diagnostic abnormality detecting means for detecting the abnormality of the hard disk device by judging the received diagnostic result response;
Have
In the patrol diagnosis condition, the storage areas of the plurality of hard disks are divided into a first storage area where data can be accessed based on an instruction from a higher-level device, and a second area different from the first storage area. Including conditions to set,
The diagnostic command issuing means issues the diagnostic execution command to the second area . A disk array device having a plurality of hard disk devices and a control unit that controls the plurality of hard disk devices,
The controller is
A diagnostic command issuing means for sequentially issuing a predetermined diagnostic execution command to each of the hard disk devices based on the held patrol diagnostic conditions;
Diagnostic response receiving means for receiving a predetermined diagnostic result response from execution of the diagnostic execution command from the hard disk device;
A diagnostic abnormality detecting means for detecting the abnormality of the hard disk device by judging the received diagnostic result response;
Have
In the patrol diagnosis condition, the storage areas of the plurality of hard disks are divided into a first storage area where data can be accessed based on an instruction from a higher-level device, and a second area different from the first storage area. Including conditions to set,
The diagnostic command issuing means issues the diagnostic execution command to the second area.
Disk array device. A disk array device that controls multiple hard disk devices
Based on patrol diagnosis condition held sequentially issues a predetermined diagnosis execution instruction to each of the hard disk drive,
Receiving a predetermined diagnosis result response from the execution of the diagnosis execution command from the hard disk device;
An abnormality of the hard disk device is detected by judging the received diagnostic result response
A patrol diagnosis method,
In the patrol diagnosis condition, the storage areas of the plurality of hard disks are divided into a first storage area where data can be accessed based on an instruction from a higher-level device, and a second area different from the first storage area. Including conditions to set,
The issuance of the diagnostic instruction is an issuance to the second area . The patrol diagnosis method. To a disk array device that controls multiple hard disk devices,
Based on the held patrol diagnosis conditions, each hard disk device is sequentially issued a predetermined diagnosis execution command,
Receiving a predetermined diagnosis result response from the execution of the diagnosis execution command from the hard disk drive;
An abnormality of the hard disk device is detected by judging the received diagnosis result response
A patrol diagnosis control program,
In the patrol diagnosis condition, the storage areas of the plurality of hard disks are divided into a first storage area where data can be accessed based on an instruction from a higher-level device, and a second area different from the first storage area. Including conditions to set,
The issuance of the diagnostic instruction to be executed by the disk array device is an issuance to the second area.
Patrol diagnostic control program.

Images