JP4935643B2 - Disk array storage system and initialization method and initialization program at the time of new installation or expansion - Google Patents

Description

  The present invention relates to a disk array storage system using a magnetic disk device, and more particularly to a disk array initialization method for performing an initialization configuration of a disk array storage system using RAID technology, a system thereof, and an initialization program.

  2. Description of the Related Art Disk array storage systems are widely used in which a set of hard disk drives (Hard Disk Drives: HDDs) (also referred to as “magnetic disk devices”) is configured and operated as a highly reliable storage device with a large storage capacity. In this disk array storage system, RAID (Redundant Arrays of Inexpensive Disks) technology that uses a redundant configuration of a magnetic disk device is used in order to increase the capacity and performance and to ensure necessary reliability. . It is well known that RAID technology has a classification from level 0 to level 6 depending on the form of the redundant configuration.

  Incidentally, RAID-1 (level 1) is a method of duplexing by pairing two HDDs and writing the same data to the two HDDs, and is also called mirroring. Even if one HDD breaks down, reading and writing continues normally on only one side, so the reliability is high. However, the hardware configuration is doubled, the use efficiency of the storage capacity is 50%, and the cost is high.

  RAID-5 (level 5) is for improving the disadvantages of the RAID-4 (level 4) configuration including (n-1) HDDs for data storage and a dedicated HDD for storing the parity part. Invented, the parity portion is distributed and stored in each HDD, so that the simultaneous writing operation to a plurality of HDDs can be performed, and the writing speed of the small block data is increased. There are two types of parity rules: odd and even parity.

  By the way, initialization of a magnetic disk device when a disk array storage system having such a RAID configuration is newly installed or added for capacity increase or the like is performed by writing initialization data in its enormous storage area. Assuming that it takes about 1 to 2 minutes per one magnetic disk device, the disk array storage system composed of a plurality of magnetic disk devices takes time required for initialization.

With respect to this problem, some proposals have been made to reduce the time for initialization operation when a disk array storage system is newly installed or added. One of them is that, unlike normal initialization, the initialization data (specific pattern such as “0”) is not actually written to the magnetic disk device, but is provided for each block or track unit of the storage area. If only "Initialization state flag" is set to "Set (initialization state)" and there is an actual data write command, the "Initialization state flag" is checked. For example, the initialization data is written in the remaining part of the track used for writing, and then the “initialization state flag” of the track is changed to the “reset” state. A technique is disclosed in which a normal write operation is performed if the “flag” is in the “reset” state (Patent Documents 1 and 2).
JP 05-324453 A Republished patent WO02 / 017055

  However, according to this method, since initialization is not performed and writing is not performed, the initialization time can be shortened. However, for example, for the initialization for each track in association with normal writing after the actual operation starts. Since writing is performed, the speed is lowered at the initial stage of operation, and there is an inconvenience that an extra operation of always referring to the initialization flag is performed during the operation.

  As described above, in the existing method, when a disk array storage system is newly installed or added, in order to achieve data consistency between the magnetic disk devices, data writing to the magnetic disk device is required for the storage capacity, and the initial setting time is increased. There is a problem that the responsiveness and convenience become worse. In addition, a large number of write commands for RAID configuration are issued to the expanded magnetic disk device when the expansion is performed, which causes performance degradation during normal operation compared to when the expansion is not performed. There were always inconveniences.

(Object of invention)
SUMMARY OF THE INVENTION In view of the above problems, the present invention aims to shorten initialization time when newly installing or adding a disk array storage system, and to improve responsiveness and convenience without causing performance degradation during normal operation. It is an object of the present invention to provide a storage system, an initialization method thereof, and an initialization program.

In order to solve the above-described problems, a disk array storage system according to the present invention includes a plurality of magnetic disk devices that are targets of RAID configuration, and an array control device that controls RAID setting and operation of each magnetic disk device. Each of the magnetic disk devices includes a data storage area for storing data and an initialization confirmation area for storing initialization information indicating whether or not the data storage area has been initialized. The array controller, when newly installing or adding a magnetic disk device, sequentially refers to the initialization information in the initialization confirmation area of each magnetic disk device to determine whether or not initialization has been performed, When a non-initialized magnetic disk device is determined, the uninitialized magnetic disk device is instructed to initialize and the uninitialized magnetic disk device is instructed. Information storage means for storing information related to the RAID configuration when initialization of the disk device is completed, and the array control means corresponds to a data storage area of each magnetic disk device and corresponds to a RAID parity area. Parity initialization means that sends a command to write “1” according to the odd parity rule only for the part, and initialization information in the initialization confirmation area on the disk device that has been initialized is cleared and changed to reset information It is characterized by having a configuration provided with a resetting means .

In order to solve the above-described problem, a disk array initialization method according to the present invention includes a plurality of magnetic disk devices that are targets of RAID configuration, and an array that controls RAID setting and operation of each magnetic disk device. In a disk array storage system provided with a control device, when a magnetic disk device is newly installed or added, an initial state provided by each magnetic disk device to obtain information on whether or not each magnetic disk device has been initialized An initialization confirmation area reference process for sequentially referring to the initialization confirmation areas, an initialization determination process for determining whether or not each magnetic disk device has been initialized based on information obtained from each initialization confirmation area, and each magnetic field a data storage area of the disk device, finger writing "1" only in accordance with odd parity rule to a portion corresponding to the RAID parity region Information for setting a RAID configuration for each magnetic disk device when the uninitialized magnetic disk device is not determined in the parity initialization step and the initialization determination step. An information storage step for completing configuration setting preparation, and a reset information setting step for clearing the initialized information in the initialization confirmation area of the magnetic disk device that has been initialized to change to reset information And

Furthermore, in order to solve the above-described problems, a disk array initialization program according to the present invention includes a plurality of magnetic disk devices that are targets of RAID configuration, and an array that controls RAID setting and operation of each magnetic disk device. In a disk array storage system provided with a control device, when a magnetic disk device is newly installed or added, an initial state provided by each magnetic disk device to obtain information on whether or not each magnetic disk device has been initialized Initialization confirmation area reference function for sequentially referencing the initialization confirmation area, initialization determination function for determining whether or not each magnetic disk apparatus has been initialized based on information obtained from each initialization confirmation area, and each magnetic disk apparatus a data storage area, only the portion corresponding to the RAID parity area, writes "1" in accordance with odd parity law Stores information for setting a RAID configuration for each magnetic disk device when a non-initialized magnetic disk device is not identified by the discrimination processing by the parity initialization function and the initialization discrimination function for sending commands. An information storage function that completes the preparation for setting the RAID configuration, a reset information setting function that clears the initialized information in the initialization confirmation area of the magnetic disk device that has been initialized, and changes it to reset information. > Is realized by a computer included in the array controller.

  As a result, according to the present invention, it is only necessary to refer to and determine the initialization confirmation area of the magnetic disk device in the initialization setting of the magnetic disk device when the disk array storage system is newly added. In principle, this is unnecessary, the initialization setting time is significantly shortened, and there is no deterioration in performance during normal operation, resulting in improved responsiveness and convenience.

(First embodiment: RAID-1 and even parity RAID-5)
Next, a disk array storage system according to the first embodiment of the present invention will be described with reference to the drawings. FIG. 2 shows a configuration diagram of the disk array storage system 1 having a RAID-1 configuration. The disk array storage system 1 includes four magnetic disk devices 21 to 24 and an array controller (array control device) 50.

  First, the configuration of the internal storage areas of these magnetic disk devices 21 to 24 will be described with reference to FIG. In FIG. 3, in the internal storage area (address space) of the magnetic disk device 10, a data storage area 10A, which is an area for storing actual data, and initialization of this data storage area 10A are completed (for example, “0”). An initialization confirmation area 10B for storing initialization information indicating whether or not data is being written is provided. This initialization confirmation area 10B indicates the initialization state of the entire magnetic disk device 10, and theoretically may be at least one bit of information, but an appropriate set of bits (bytes, etc.) is adapted to the environment. Can be used.

  Since the initialization information is written in the initialization confirmation area 10B, the initialization state of the data storage area, that is, the “0” data writing state can be easily confirmed simply by checking the initialization information. When newly installing or adding the magnetic disk device 10 to an actual disk array storage system, there is little writing to the magnetic disk device 10 for data matching required for RAID configuration, and the RAID configuration of the disk array storage system can be achieved in a short time. Completion will not cause performance degradation during normal operation, resulting in improved responsiveness and convenience.

  The initialization information in the initialization confirmation area 10B is returned to a reset state (a state that is not an initialization state) after the RAID configuration is completed. This is because an uninitialized magnetic disk device or a magnetic disk device that is no longer in an initialized state is not erroneously determined as having been initialized. Specifically, it is assumed that the magnetic disk device incorporated in the RAID configuration is transferred to another device, or once removed from the RAID configuration for some reason such as failure, and then incorporated again. At this time, the magnetic disk device once incorporated into the RAID configuration and written with data cannot be handled as initialized (usually “0” write) unlike the magnetic disk device immediately after shipment from the factory. In order to detect this, the initialization confirmation area is reset.

  Further, the initialization information in the initialization confirmation area 10B is referred to only when newly installed or added, and is not referred to during normal operation.

Next, returning to FIG. 2, the RAID-1 configuration and the array controller (array controller) 50 will be described.
Here, the RAID-1 configuration is a redundant configuration method that consists of a pair of magnetic disk devices and duplicates data, and is also called mirroring because the exact same data is written to each pair of magnetic disk devices. Here, there is shown mirroring composed of two pairs, that is, a pair of magnetic disk devices 21 and 22, and a pair of magnetic disk devices 22 and 23.

In such a RAID-1 configuration, the utilization efficiency of the storage capacity is low and the cost is high, but the reliability is high in that reading and writing can continue normally only on one side even if one of the magnetic disk devices fails. In addition, when data is written, the performance is reduced because data is written to both of the two magnetic disk devices. However, when data is read, the performance is twice as high as when mirroring is not performed. is doing.
Here, a RAID-1 configuration including two pairs of magnetic disk devices is shown as an example, but the number of pairs may be large, or a minimum of one pair of magnetic disk devices may be used.

  The array controller (array control device) 50 controls a write / read operation with respect to the magnetic disk devices 21 to 24 based on a write / read command (command) from a host computer (not shown). Further, the array controller 50 implements RAID technology that monitors the magnetic disk devices 21 to 24 and improves reliability and performance.

  That is, the array controller (array control device) 50 is divided and stored in each of the magnetic disk devices 21 to 24 by configuring the RAID using a plurality of magnetic disk devices 21 to 24, and configuring the RAID. A function to return the information to the original information, a function that keeps operating as long as the RAID configuration permits even if a broken magnetic disk device is discovered, and a type of RAID to be incorporated 21 to 24 are provided with a function of issuing an appropriate command at an appropriate address.

  In addition, as shown in FIG. 1, the array controller 50 includes components for performing initialization setting of a RAID configuration required when newly installing or adding the disk array storage system 1.

  In FIG. 1, the array controller 50 determines whether or not initialization has been completed by sequentially referencing each component operating at the time of initialization setting, that is, the initialization confirmation areas 21 </ b> B to 24 </ b> B of the magnetic disk devices 21 to 24. And, if the result of the determination is that the data storage area of the magnetic disk device is not initialized, in order to initialize (write “0”), the magnetic disk device has an initialization command FORMAT. When the command sending means 52 for sending the command, the determination of the initialization confirmation areas 21B to 24B of all the magnetic disk devices 21 to 24 are finished, the information saving means 53 for saving the RAID information and finishing the RAID configuration, and the magnetic disk Reset means 54 for changing the initialized information in the initialization confirmation areas 21B to 24B of the devices 21 to 24 to reset information, and And a main control unit 56 for controlling these means as a whole.

  The determining means 51 sequentially refers to the initialization confirmation areas 21B to 24B of the magnetic disk devices 21 to 24 to determine whether or not the initialization has been completed. By providing this discriminating means 51, if the magnetic disk device has been initialized at the time of shipment or when the RAID configuration is incorporated, it is only necessary to refer to and discriminate the initialization confirmation area when the disk array storage system is newly added. Since the initialization of the magnetic disk device is completed, the time required for the initialization setting is greatly shortened, and the performance is not deteriorated during normal operation, and the responsiveness and convenience are improved. In addition, since there is no writing, there is an effect of reducing the load on the array controller.

  The command sending means 52 initializes the data storage area of the magnetic disk device ("0" write) if the initialization confirmation area is reset information as a result of the above determination. A FORMAT command is sent to the magnetic disk device. By providing the command sending means 52, even if the magnetic disk device is not initialized at the time of shipment, if the judging means 51 discriminates it from the initialization confirmation area, the command sending means 52 Since the command for starting the initialization (formatting) operation of the magnetic disk device itself is sent and the initialization is performed, the time required for the initialization configuration is also shortened, and the responsiveness and convenience are improved. .

Further, the reset means 54 changes the initialized information in the initialization confirmation areas 21B to 24B of the magnetic disk devices 21 to 24 to reset information. By providing this reset means 54, when the magnetic disk device once incorporated in the disk array is reassembled, the magnetic disk device is not initialized, or once written and no longer in the initialized state. Therefore, it is possible to prevent erroneous setting.
The initialization information in the initialization confirmation areas 21B to 24B is referred to only when newly installed or added, and is not referred to during normal operation.

  The command sending means 52 does not need to be specially provided for the initialization, and usually the command sending means possessed by the array controller 50 only needs to be used for this purpose.

Further, the information storage means 53 does not need to be provided in the array controller 50 as described above. For example, the RAID information may be stored using a certain area of the magnetic disk device.
Details of the initialization setting operation by these components will be described below.

(Explanation of initialization settings for new and expanded)
FIG. 4 shows an operation sequence in which the disk array storage system 1 executes the RAID-1 initialization configuration. Here, in RAID-1, the contents of the data stored in the paired magnetic disk devices need to match. Therefore, for example, in FIG. 2, when the magnetic disk devices 21 and 22 and the magnetic disk devices 23 and 24 are paired to form RAID-1, the magnetic disk devices 21 and 22 and the magnetic disk device 23 The contents of the data storage areas 21A and 22A stored in 24 and the contents of the data storage areas 23A and 24A are operated so as to match.

  Here, before entering the details of the operation of the present embodiment, an example of an initialization sequence in the existing RAID system will be described in order to clarify the characteristics of the initialization operation in comparison with the existing operation (FIG. 9). reference). As shown in FIG. 9, the operation first confirms that there is a magnetic disk device that constitutes the RAID (step S320). In the next operation, data conforming to the RAID configuration is written to the magnetic disk device in order to match data between the magnetic disk devices constituting the RAID (step S330). When the writing of this data is completed, assuming that the RAID configuration is completed, the RAID configuration setting information is saved in the array controller or the data storage area of the magnetic disk device, and the RAID configuration setting is completed (step S340). ).

  On the other hand, in the operation sequence of the present embodiment shown in FIG. 4, first, the presence of the magnetic disk device for performing the RAID configuration setting is confirmed (step S120), but the next step S121 is performed. Is different.

  In step S121, the initialization information stored in the initialization confirmation areas 21B to 24B in FIG. 2 is referred to to determine whether or not the magnetic disk devices 21 to 24 for which the RAID configuration setting is to be performed (initialization). Confirmation region reference step), confirmation / determination is performed based on the initialization information (step S121, initialization discrimination step).

  If it is determined in this determination step that the magnetic disk device has been initialized, the process proceeds to step S123 in FIG. 4 to determine whether there is another magnetic disk device used in the same RAID configuration setting. If it exists, the process returns to step S121 (initialization determination step) to check the initialization state of the magnetic disk device in the initialization confirmation areas 21B to 24B.

  On the other hand, if a magnetic disk device that has not been initialized is found in the determination step (step S121), the process proceeds to step S122, and the initialization (formatting) means provided in the magnetic disk device itself is activated. Then, an initialization command “FORMAT command” for initializing the magnetic disk device is sent (step S122, initialization command process). At this time, since the initialization function in the magnetic disk device of the magnetic disk device itself is used, the array controller 50 issues an “FORMAT command” that is an initialization command to the magnetic disk device (initialization command process). Therefore, it is not necessary to issue a command for accessing a data storage area in the magnetic disk device such as another write command “WRITE” or read command “READ”, so that the performance of the array controller 50 does not deteriorate.

  In this way, when it is confirmed that all the magnetic disk devices 21 to 24 constituting the RAID have been initialized, the process proceeds to the next step S140, where the RAID configuration information is saved and the RAID configuration setting is completed ( Step S140, information storage step).

  Finally, the initialization confirmation areas 21B to 24B of the magnetic disk devices 21 to 24 are cleared, that is, reset to a reset state (step S150, reset information setting step). This is because when a magnetic disk device that has been used once is removed from the configuration for some reason and then re-installed, it has not been initialized, or once written and no longer initialized. This is because the magnetic disk device is not erroneously determined to have been initialized.

  As described above, when the initialization confirmation areas 21B to 24B indicate that the magnetic disk devices 21 to 24 constituting the RAID have been initialized, the array controller 50 controls the magnetic disk devices 21 to 24. Thus, there is no need to issue a command such as a write command “WRITE” or a read command “READ” for accessing the data storage areas 21A to 24A in the magnetic disk device. Therefore, the RAID configuration setting can be completed in a short time. In addition, since access to the magnetic disk device is minimized, the array controller 50 can access the added RAID configuration even in the array controller 50 in which the RAID configuration is already configured in another magnetic disk device. continue.

(Initialization method for disk array)
Here, the disk array initialization method is configured by the initialization confirmation area reference process, the initialization determination process, the initialization command process, the information storage process, and the reset information setting process described in the above operation sequence. Yes.

That is, in the disk array initialization method for performing the initialization setting of the disk array storage system 1, in order to obtain information on whether or not each of the magnetic disk devices 21 to 24 has been initialized, each of these magnetic disk devices 21 to 21 is used. An initialization confirmation region reference step for sequentially referring to the initialization confirmation regions 21B to 24B included in 24,
An initialization determination step for determining whether or not each of the magnetic disk devices 21 to 24 has been initialized based on information obtained from the respective initialization confirmation areas 21B to 24B, and a magnetic field that has not been initialized in the initialization determination step. An initialization command process that functions when a disk device is determined and commands initialization of the uninitialized magnetic disk device, and information for setting a RAID configuration for each magnetic disk device is stored. The information storage step for completing the preparation for setting the information RAID configuration and the reset information setting step for changing the initialization information in the initialization confirmation areas 21B to 24B of the magnetic disk devices 21 to 24 to reset information are provided.

  As a result, if the magnetic disk device is already initialized when the RAID configuration is incorporated, the initialization of the magnetic disk device is completed by simply referring to and determining the initialization information in the initialization confirmation area, and the time required for initialization setting. Has the effect of significantly shortening.

  In addition, even if the magnetic disk device is not initialized at the time of shipment, it is detected from the initialization confirmation area and initialized by starting the initialization (format) operation of the magnetic disk device itself. As a result, the time required for the initialization configuration is shortened, the performance is not deteriorated during normal operation, and the responsiveness and convenience are improved. In addition, since there is no write command, there is an effect of reducing the load on the array controller.

(Initialization program for disk array)
Also, the functions corresponding to the contents of the initialization confirmation area reference process, initialization determination process, initialization command process, information storage process, and reset information setting process described in the above operation sequence are realized by a computer. What is configured as a program is a disk array initialization program.

  That is, in a disk array storage system 1 including a plurality of magnetic disk devices 21 to 24 that are targets of RAID configuration, and an array control device that controls RAID setting and operation of each of these magnetic disk devices. An initialization confirmation area reference function for sequentially referring to the initialization confirmation areas 21B to 24B included in each of the magnetic disk devices 21 to 24 in order to obtain information on whether or not each of the magnetic disk devices 21 to 24 has been initialized. An initialization discriminating function for discriminating whether or not each of the magnetic disk devices 21 to 24 has been initialized based on information obtained from the respective initialization confirmation areas 21B to 24B, and an uninitialized by discriminating processing by this initialization discriminating function An initialization command function that operates when a magnetic disk device is identified and instructs the uninitialized magnetic disk device to perform initialization. When the initialization of the disk devices 21 to 24 is completed, the information storage function that stores information for setting the RAID configuration for each magnetic disk device and completes the preparation for setting the RAID configuration, and the information storage processing by the information storage function After that, the computer having the array control device 50 realizes a reset information setting function for changing the initialization information set in the initialization confirmation areas 21B to 24B of the magnetic disk devices 21 to 24 to reset information. It is configured as follows.

  As a result, if the magnetic disk device has been initialized, simply referencing and determining the initialization confirmation area, the initialization of the magnetic disk device is completed and the time required for initialization is greatly reduced. Even if the magnetic disk device is not initialized at the time of shipment, it can be initialized by determining it from the initialization confirmation area and starting the initialization operation of the magnetic disk device itself. The time required for the initialization configuration is shortened, and the performance is not deteriorated during normal operation, and the responsiveness and convenience are improved.

(Even parity RAID-5)
In the above embodiment, the case of RAID-1 (mirroring) has been described as an example of the configuration of RAID. However, for example, the disk array storage system may be RAID-5 using even parity.

  FIG. 5 is a configuration diagram of the disk array storage system 2 including the array controller 60 and the magnetic disk devices 31 to 35. In FIG. 5, the array controller 60 is configured to implement RAID-5 using magnetic disk devices 31-35. The components necessary for the initialization of the array controller 60 are basically the same as those of the RAID-1 array controller 50 described above.

  Here, the magnetic disk devices 31 to 35 are provided with a data storage area and an initialization confirmation area in the same manner as the magnetic disk apparatus described in the disk array storage system 1. Here, since the configuration is RAID-5, the data storage area of each magnetic disk device is divided into a data portion and a parity portion for realizing RAID-5. As shown in FIG. 5, the data storage areas 32A-4, 33A-3, 34A-2, and 35A-1 are parity parts in RAID-5, and the remaining parts 31A-1 to 31A- 4, 32A-1 to 32A-3, 33A-1, 33A-2, 33A-4, 34A-1, 32A-3, 34A-4, 35A-2 to 35A-4 are the data part in RAID-5. Become.

  The present disk array storage system 2 employs even parity as a parity check. In the case of even parity, the data portion and the parity portion are adjusted to include an even number (including zero) of “1”. Therefore, if it is determined by checking the initialization confirmation areas 31B to 35B that the data storage areas 31A to 35A of all the magnetic disk devices 31 to 35 are initialized ("0" write), Since “1” is not included, the even parity condition in the parity part is automatically satisfied, and the RAID configuration setting can be completed without accessing the magnetic disk devices 31 to 35 thereafter.

  Also in this case, the initialization configuration is performed in exactly the same manner in accordance with the initialization setting sequence shown in FIG. Therefore, if all the magnetic disk devices have been initialized, the initialization of the magnetic disk device at the time of newly adding the disk array storage system 2 is completed and the initialization set time only by referring to and determining the initialization confirmation area. In the unlikely event that the magnetic disk device is not initialized at the time of shipment, it is determined from the initialization confirmation area, and the initialization (format) operation of the magnetic disk device itself is performed. Since the initialization can be performed by starting from the array control apparatus, the initialization setting time is shortened, the performance is not deteriorated during normal operation, and the responsiveness and convenience are improved.

(Second Embodiment)
Next, a disk array storage system having an odd parity RAID-5 configuration will be described with reference to the drawings as a disk array storage system according to a second embodiment of the present invention.

  FIG. 6 is a block diagram of the present disk array storage system 3 (odd parity RAID-5 configuration), comprising an array controller (array controller) 70 and magnetic disk devices 31-35. These magnetic disk devices 31 to 35 have the same data storage area and initialization confirmation area as the magnetic disk device 10 described with reference to FIG.

  This disk array storage system 3 employs an odd parity RAID-5 configuration. Therefore, the data storage areas 32A-4, 33A-3, 34A-2, and 35A-1 serving as the parity part of RAID-5 are the remaining data storage areas excluding the parity part in order to match the odd parity. -1 to 31A-4, 32A-1 to 32A-3, 33A-1, 33A-2, 33A-4, 34A-1, 34A-3, 34A-4, 35A-2 to 35A-4 An operation is performed to write.

  The present embodiment is different from the first embodiment in that a write operation for parity initialization exists. In FIG. 6, an array controller (array controller) 70 mediates a write / read command (command) from a host computer (not shown) and controls a write / read operation to the magnetic disk devices 31 to 35. The array controller 70 monitors the magnetic disk devices 31 to 35 and realizes a RAID technology that improves reliability and performance. That is, a function that allows a RAID to be configured using a plurality of magnetic disk devices 31 to 34, a function that restores information that is divided and stored in each of the magnetic disk devices 31 to 34 by configuring RAID, Even when a broken magnetic disk device is found, a function that keeps operating as long as the RAID configuration permits by disconnecting the broken magnetic disk device, and an appropriate command with an appropriate address for the magnetic disk devices 31 to 34 depending on the type of RAID to be incorporated It is configured with a function to output.

  In addition, the array controller 70 includes components for performing initialization settings such as a RAID configuration necessary for newly installing or adding a disk array storage system 3 characteristic of the present embodiment as shown in FIG. I have.

  In FIG. 7, the array controller 70 determines whether or not initialization has been completed by sequentially referencing each component operating at the initialization setting, that is, the initialization confirmation areas 31 </ b> B to 35 </ b> B of the magnetic disk devices 31 to 35. And a command transmission for sending a FORMAT command to the magnetic disk device to initialize (write “0”) the data storage area of the magnetic disk device if it is not initialized. When the determination of the means 72 and the initialization confirmation areas 31B to 35B of all the magnetic disk devices 31 to 35 is completed, an odd parity is set in the data storage area of each magnetic disk device and corresponding to the RAID parity area. Parity initialization means 75 for sending a command to write “1” in accordance with the rules, and RAID information is saved and RAID is stored. Information storage means 73 for completing the composition, reset means 74 for changing the initialization information in the initialization confirmation areas 31B to 35B of the magnetic disk devices 31 to 35B to reset information, and a main control section 76 for controlling these means. It is configured with.

  The difference from the array controller 50 according to the first embodiment is that a parity initialization means 75 is added. The parity initialization means 75 sends a command to write “1” in accordance with the odd parity rule in the data storage area of each magnetic disk device and corresponding to the RAID parity area. With this parity initialization means 75, even in the case of an odd-parity RAID configuration, it is only necessary to write “1” in the parity portion. Therefore, if the disk array storage system has n magnetic disk device configurations, Since 1 / n of the pre-storage capacity is sufficient, the initialization time is greatly shortened compared to the conventional case, and the performance is not deteriorated during normal operation, and the responsiveness and convenience are improved.

  Next, the detailed operation of the above initialization setting will be described with reference to the drawings. FIG. 8 is an operation sequence diagram for initialization setting. First, the steps (step S221 to step S223) for checking whether or not the magnetic disk devices 31 to 35 have been initialized are the same as those in the first embodiment (the process shown in FIG. 4).

  That is, first, the existence of the magnetic disk device for performing the RAID configuration setting is confirmed (step S220), and then the initialization confirmation in FIG. 6 is performed to check whether or not the magnetic disk device for performing the RAID configuration setting has been initialized. The initialization information of the areas 31B to 35B is referred to (initialization confirmation area reference process), and confirmation / determination is performed based on the initialization information (step S221, initialization determination process).

  If it is determined in this determination step that the magnetic disk device has been initialized, the process proceeds to step S223 in FIG. 8, and it is determined whether there is another magnetic disk device used in the same RAID configuration setting. If it exists, the process returns to step S221 (initialization determination step) to check the initialization state of the magnetic disk device in the initialization confirmation areas 31B to 35B.

  On the other hand, in the above-described initialization determination step (step S221), when a magnetic disk device that has not been initialized is found, the process proceeds to step S222, and the initialization (format) means provided in the magnetic disk device itself is activated. Then, an initialization command is sent to initialize the magnetic disk device (step S222, initialization command process). At this time, since the initialization function of the magnetic disk device itself is used, the array controller 70 issues an “FORMAT command” that is an initialization command to the magnetic disk device (initialization command process). ) Only, it is not necessary to issue a command for accessing a data storage area in the magnetic disk device such as another write command “WRITE” or read command “READ”.

  In this way, all the magnetic disk devices 31 to 35 constituting the RAID are initialized. Here, in the present embodiment, since the parity is odd, even if “0” is written in the data storage area of each of the magnetic disk devices 31 to 35 by initialization, it plays the role of the parity part in the RAID configuration. It is necessary to write “1” in the data storage area of the magnetic disk device.

  Accordingly, the process proceeds to the next step S230, and it is determined whether or not the data storage area of each magnetic disk device is a portion 32A-4, 33A-3, 34A-2, 35A-1 corresponding to a RAID parity area. A determination is made (step 230), and if so, a command to write “1” is sent according to the odd parity rule (step S231, parity initialization step).

  The actual value of the data to be written depends on the value of the data part of RAID-5. For example, in order to determine the value of the data storage area 32A-4 which is the parity part of RAID-5 in FIG. The values of the data storage areas 31A-4, 33A-4, 34A-4, and 35A-4 of the devices 31, 33, 34, and 35 are required. If it is confirmed that all the data storage areas 31A-4, 33A-4, 34A-4, and 35A-4 are in the initialization state by checking the initialization confirmation area, their values are all “0”. Therefore, the configuration of RAID-5 can be completed by writing “1” only in the data storage area 32A-4 as the parity part. In this case, 1/5 is sufficient as compared with the case of writing to all. Therefore, the time required for initialization setting is also greatly reduced.

  Thus, when the parity of RAID-5 is set to an odd number, the RAID configuration information is stored and the RAID configuration setting is completed (step S240, information storage step).

  Finally, the initialization confirmation areas 31B to 35B of the magnetic disk devices 31 to 34 are cleared, that is, reset to a reset state (step S250, reset information setting step). This is because when a magnetic disk device that has been used once is removed from the configuration for some reason and then re-installed, it has not been initialized, or once written and no longer initialized. This is because the magnetic disk device is not erroneously determined to have been initialized.

  As described above, when the initialization confirmation areas 31B to 35B indicate that the magnetic disk devices 31 to 35 constituting the RAID have been initialized, the array controller 70 stores the data of the magnetic disk devices 31 to 35. Since “1” is written in accordance with the odd parity rule only for the parity portions of the storage areas 31A to 35A, the RAID configuration can be completed in a short time.

  Here, a disk for odd parity is obtained by the initialization confirmation area reference process, initialization determination process, initialization command process, parity initialization process, information storage process, and reset information setting process described in the above operation sequence. An array initialization method is configured.

  That is, in the odd parity disk array initialization method for initializing the disk array storage system 3, the data storage areas 31A to 35A for storing data and whether or not the data storage areas have been initialized ("0" write). Initialization confirmation area reference step for sequentially referring to the initialization confirmation areas 31B to 35B of the magnetic disk devices 31 to 35 having the initialization confirmation areas 31B to 35B for storing initialization information indicating the initialization information, and the initialization information An initialization determination step for determining whether or not initialization has been completed based on the result, and if the result of the determination is that the initialization confirmation areas 31B to 35B are reset information, the data storage area of the magnetic disk device is In order to initialize ("0" write), a command that instructs the magnetic disk device to perform initialization from the array controller (array controller) 70 When the initialization command process for sending the data and the initialization determination process for the initialization confirmation areas 21B to 24B of all the magnetic disk devices 21 to 24 are completed, the data storage areas of the magnetic disk devices 31 to 35 are stored. A parity initialization step of sending a command to write “1” to the portion corresponding to the parity region of the RAID according to the odd parity rule, an information storage step of saving the RAID information and ending the RAID configuration, and a magnetic disk device A reset information setting step for changing the initialized information in the initialization confirmation areas 21B to 24B of 21 to 24 to reset information.

  As a result, if the magnetic disk unit has been initialized, just refer to and check the initialization confirmation area. If the magnetic disk unit has not been initialized at the time of shipment, the initialization check Since it is discriminated from the area and initialized by starting the initialization (formatting) operation of the magnetic disk device itself, “1” is written only in the parity part by the parity initialization process. With a disk array storage system with n magnetic disk units, the write time can be reduced to 1 / n of the previous storage capacity, so the initialization time is greatly reduced compared to the conventional case, and performance degradation during normal operation is also possible. Immediate responsiveness and convenience are improved.

(program)
Also, it corresponds to the contents of the initialization confirmation area reference process, initialization determination process, initialization command process, parity initialization process, information storage process, and reset information setting process described in the above operation sequence. An odd parity disk array initialization program is configured as a program for realizing the function by a computer.

  That is, in a disk array storage system 1 including a plurality of magnetic disk devices 31 to 35 that are targets of RAID configuration and an array control device that controls RAID setting and operation of each of these magnetic disk devices. An initialization confirmation area reference function for sequentially referring to the initialization confirmation areas 31B to 35B included in each of the magnetic disk apparatuses 31 to 35 in order to obtain information on whether or not each of the magnetic disk apparatuses 31 to 35 has been initialized. An initialization discriminating function for discriminating whether or not each of the magnetic disk devices 31 to 35 has been initialized based on information obtained from the respective initialization confirmation areas 31B to 35B. An initialization command function that operates when a magnetic disk device is identified and instructs the uninitialized magnetic disk device to perform initialization. When the initialization of the disk devices 31 to 35 is completed, a command for writing “1” in accordance with the odd parity rule is sent to the data storage areas 31A to 35A of each magnetic disk device corresponding to the RAID parity area. Parity initialization function, information storage function for completing the RAID configuration setting preparation by storing information for setting the RAID configuration for each of the magnetic disk devices 31 to 35 when the parity initialization is completed, and its information storage function The array controller 50 has a reset information setting function for changing the initialization information set in the initialization confirmation areas 31B to 35B of the magnetic disk devices 31 to 35 to reset information after the information storage processing by the computer. It is configured to be realized.

  As a result, if the magnetic disk unit has been initialized, just refer to and check the initialization confirmation area. If the magnetic disk unit has not been initialized at the time of shipment, the initialization check It is only necessary to write “1” only in the parity portion by performing the parity initialization process after discriminating it from the area and initializing it by starting the initialization (format) operation of the magnetic disk device itself. In the case of a disk array storage system having n magnetic disk units, the storage capacity can be reduced to 1 / n of the previous storage capacity. Therefore, the initialization time is greatly reduced compared to the conventional case, and the performance is deteriorated during normal operation. Therefore, there is an effect that quick response and convenience are improved.

3 is a block diagram showing components necessary for an initialization operation included in the array controller of the disk array storage system according to the first embodiment of the present invention. FIG. 1 is a configuration block diagram of a disk array storage system (RAID-1 configuration) according to a first embodiment of the present invention. FIG. 2 is a diagram showing usage classifications of storage areas of the magnetic disk device disclosed in FIG. 1. FIG. 3 is a sequence diagram showing an initialization operation of the disk array storage system (RAID-1 configuration) shown in FIG. 2. It is a block diagram which shows the example of 1 structure of the disk array storage system (even parity RAID-5 structure) as another example which concerns on 1st Embodiment. It is a block diagram which shows one structural example of the disk array (odd parity RAID-5 structure) which concerns on the 2nd Embodiment of this invention. FIG. 7 is a block diagram showing components necessary for an initialization operation included in the array controller portion shown in FIG. 6. FIG. 7 is a sequence diagram showing an initialization operation of the disk array storage system (odd parity RAID-5 configuration) shown in FIG. 6. It is a sequence diagram which shows an example of RAID structure initialization operation | movement of the one disk array storage system in related technology.

Explanation of symbols

1 Disk array storage system (RAID-1)
2 Disk array storage system (RAID-5 with even parity)
3 Disk array storage system (odd parity RAID-5)
DESCRIPTION OF SYMBOLS 10 Magnetic disk apparatus 10A Data storage area 10B Initialization confirmation area 21-24 Magnetic disk apparatus (RAID-1 structure)
21A-24A Data storage areas 21B-24B Initialization confirmation areas 31-35 Magnetic disk device (in RAID-5 configuration)
31A-m to 35A-m Data storage areas 31B to 35B of magnetic disks 31 to 35 Parity of initialization confirmation areas 32A-4, 33A-3, 34A-2, 35A-1 RAID-5 of magnetic disks 31 to 35 Part 50, 60 Array controller (array controller)
51, 71 Discriminating means 52, 72 Command sending means 53, 73 RAID information storage means 54, 74 Reset means 56, 76 Main controller 70 Array controller (array controller) (odd parity RAID-5 configuration)
75 Parity initialization means

Claims (7)

A disk array storage system comprising a plurality of magnetic disk devices that are targets of RAID configuration, and an array control device that controls RAID setting and operation of each magnetic disk device,
Each of the magnetic disk devices includes a data storage area for storing data and an initialization confirmation area for storing initialization information indicating whether or not the data storage area has been initialized.
The array control device, when newly installing or adding the magnetic disk device, sequentially refers to the initialization information in the initialization confirmation area of each magnetic disk device, and determines whether or not the initialization has been performed, When the discriminating unit discriminates a magnetic disk device that has not been initialized, the RAID configuration is instructed when the uninitialized magnetic disk device is instructed to initialize and the initialization of the uninitialized magnetic disk device is completed. And information storage means for storing the information related to
In the array control means,
Parity initialization means for sending a command to write “1” in accordance with the odd parity rule only in the data storage area of each magnetic disk device and corresponding to the RAID parity area ;
A disk array comprising: a reset unit that clears the initialized information in the initialization confirmation area on the disk device that has been initialized, and changes the reset information to reset information. Storage system. The disk array storage system according to claim 1, wherein
Command sending means for sending a command which is an initialization command for initializing the data storage area to the uninitialized magnetic disk device when the determining means determines an uninitialized magnetic disk device; A disk array storage system provided in a control device. In a disk array storage system comprising a plurality of magnetic disk devices that are targets of RAID configuration, and an array control device that controls RAID setting and operation of each magnetic disk device,
Initialization confirmation area that sequentially refers to the initialization confirmation areas of each magnetic disk device to obtain information on whether or not each magnetic disk device has been initialized when the magnetic disk device is newly installed or added A reference process;
An initialization discriminating step for discriminating whether or not each of the magnetic disk devices has been initialized based on information obtained from each of the initialization confirmation areas;
A parity initialization step of sending a command to write “1” in accordance with the odd parity rule only to a portion corresponding to a RAID parity area in the data storage area of each magnetic disk device;
Information that stores information for setting a RAID configuration for each magnetic disk device and completes preparation for setting the RAID configuration when an uninitialized magnetic disk device is not determined in the initialization determination step Preservation process ;
A reset information setting step for clearing the initialized information in the initialization confirmation area of the magnetic disk device that has been initialized, and changing the information to reset information . Initialization method. In the disk array initialization method according to claim 3 ,
An initialization command step that functions when an uninitialized magnetic disk device is determined in the initialization determination step and instructs the uninitialized magnetic disk device to perform initialization is provided before the information storage step. With
The information storage step is configured to wait for completion of initialization of the uninitialized magnetic disk device, store information for setting the RAID configuration, and complete preparation for setting the RAID configuration. To initialize the disk array. In the disk array initialization method according to claim 4 ,
An initialization method for a disk array, wherein the initialization determination step is executed by sending a command for instructing initialization from the array controller to the uninitialized magnetic disk device. In a disk array storage system comprising a plurality of magnetic disk devices that are targets of RAID configuration, and an array control device that controls RAID setting and operation of each magnetic disk device,
Initialization confirmation area that sequentially refers to the initialization confirmation areas of each magnetic disk device to obtain information on whether or not each magnetic disk device has been initialized when the magnetic disk device is newly installed or added Reference function,
An initialization discriminating function for discriminating whether or not each of the magnetic disk devices has been initialized based on the information obtained from each of the initialization confirmation areas;
Parity initialization function for sending a command to write “1” in accordance with the odd parity rule only to the data storage area of each magnetic disk device corresponding to the parity area of RAID,
When no uninitialized magnetic disk device is determined by the determination processing by the initialization determination function, information for setting a RAID configuration for each magnetic disk device is stored and preparation for setting the RAID configuration is performed. Complete information storage function ,
A computer having the array control device includes a reset information setting function for clearing the initialized information in the initialization confirmation area of the magnetic disk device that has been initialized and changing the information to reset information. An initialization program for a disk array characterized by being realized. In the disk array initialization program according to claim 6 ,
An initialization command function that operates when an uninitialized magnetic disk device is identified by the determination processing by the initialization determination function and instructs the uninitialized magnetic disk device to perform initialization. Attached to the
The information storage function is configured to wait for completion of initialization of the uninitialized magnetic disk device and store information for setting the RAID configuration to complete preparation for setting the RAID configuration. Disk array initialization program to be executed.

Images