JP2013020504A - Disk array device, logical disk control method, and control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk array device and the like capable of operating an optimal control pattern according to a plurality of applications and upper hosts.SOLUTION: A disk array device 10 includes a plurality of physical disks 12, and a controller 11 that constitutes the physical disks as a logical disk and reads and writes the data with respect to the logical disk according to an operation command from an upper host. The controller includes: an input/output control part 111a that receives the operation command from the upper host and transmits a reply thereto to the upper host; and a logical disk control part 111b that writes writing object data received from the upper host to the logical disk. The controller jointly includes: a buffer memory part 112a for temporarily storing the writing object data, and a setting storage part 112b for prestoring a plurality of types of constitutions of the physical disks as the logical disk according to the applications; and writes the data according to the constitution.

Description

  The present invention relates to a disk array device, a logical disk control method, and a control program, and more particularly to a disk array device that can operate with a short processing time and a small calculation process.

  In recent years, the importance of various types of data has increased as the degree of dependence on IT (Information Technology) has increased, and in particular, there has been an increasing demand for large-capacity storage of data for various purposes such as data distribution, databases, and backups. . Therefore, the role of mass storage devices in computer systems is increasing, and demands for higher reliability and higher performance are increasing for mass storage devices.

  Therefore, a disk array device that uses a plurality of physical disks as a logical disk that virtually corresponds to one physical disk is often used as a mass storage device that satisfies such requirements. In many cases, these disk array devices have a structure in which the same recorded contents are written in multiple layers due to a redundant configuration.

  Further, in order to prepare for destruction of recorded contents, the structure is often such that an error correcting code such as a parity code or ECC (Error Correcting Code) is recorded on a dedicated drive (physical disk). These technologies are standardized as RAID (Redundant Arrays of Independent Disks) 1 to 6 and are widely spread.

  In this connection, there are the following technical documents. Among them, Patent Document 1 describes a disk control system in which write data is stored in a log memory in a RAID booster card and written to a disk array all at once when data for one parity block is prepared. Patent Document 2 describes a data processing system in which a storage subsystem is equipped with a database and a logical volume is constructed without using hardware resources of a host server.

  Patent Document 3 describes a disk control system that reduces power consumption by separately recording data in a logical volume that can stop the rotation of a disk and a logical volume that cannot be stopped. Patent Document 4 describes a storage apparatus that determines an I / O (input / output) pattern of write data and changes a disk allocation pattern according to the pattern.

JP 2001-075741 A JP 2006-189976 A JP 2007-068443 A JP 2010-086240 A

  As described above, the disk array device is used in various applications such as data distribution, database, backup, etc., and control with a control pattern suitable for each application has been conventionally performed in the disk array device unit. . However, even though the disk array device is mostly used by configuring logical disks, it is impossible to perform control with a control pattern suitable for each application in units of logical disks. It was.

  For this reason, in particular, in a configuration in which a plurality of upper hosts share a single disk array device and the usage is different for each upper host, an optimum control pattern cannot be taken for each upper host. Therefore, the control is performed with a control pattern that is not suitable for the application. In this case, extra processing time and calculation processing are required, and there is a problem that the performance between the host and the host is deteriorated or the apparatus is overloaded.

  Techniques that can solve this problem are not described in the aforementioned Patent Documents 1 to 4. The technique of Patent Document 1 requires special hardware called a RAID booster card and cannot take an optimal control pattern for each host. The technique of Patent Document 2 does not require a special configuration on the host side, but cannot take a different control pattern for each of a plurality of host hosts.

  Since the technique of Patent Document 3 is intended to reduce power consumption, the problem to be solved is different from the present invention, and the configuration for solving the problem is also different. The technique of Patent Document 4 changes the disk allocation pattern in accordance with the type of data. That is, none of Patent Documents 1 to 4 makes it possible to change the control pattern for each of a plurality of upper hosts.

  An object of the present invention is to provide a disk array device, a logical disk control method, and a control program that operate with a control pattern that is optimal for each of a plurality of uses and upper hosts, and that can operate with a short processing time and a small amount of calculation processing. is there.

  In order to achieve the above object, a disk array device according to the present invention is a disk array device that operates by being connected to two or more upper hosts, and reads and writes data in accordance with operation commands from the upper hosts, A plurality of physical disks and a controller that configures the physical disks as logical disks and reads / writes data to / from the logical disk in response to an operation command from the host, and the controller receives the operation commands from the host An I / O controller that sends responses to the host to the host and a logical disk controller that writes the data to be written received from the host to the logical disk, and a buffer memory that temporarily stores the data to be written And logical disks of physical disks according to the usage specified by the host. Configuration of Te and features a plurality of types stored in advance in that setting storage unit, a logical disk control unit, and writes the write target data in accordance with this configuration into logical disks.

  In order to achieve the above object, a logical disk control method according to the present invention includes a plurality of physical disks, a controller configured to read / write data from / to a logical disk according to an operation command from an upper host by configuring the physical disk as a logical disk. A disk array device that operates by being connected to two or more upper hosts and reads / writes data in accordance with an operation command from the upper hosts, and is a physical disk according to an application specified by the upper host A buffer memory that is stored in advance in a setting storage unit having a plurality of types of configurations as a logical disk, receives an operation command from the host, and receives data to be written received from the host The data to be written is written to the logical disk by the logical disk controller according to the configuration. , Input-output control unit a response to operation command and transmits to the host apparatus.

  In order to achieve the above object, a logical disk program according to the present invention includes a plurality of physical disks, a controller that configures the physical disks as logical disks, and reads / writes data from / to the logical disks in accordance with operation instructions from a host. The disk array device operates by being connected to two or more upper hosts, and reads / writes data in accordance with an operation command from the upper host, and is specified by the upper host in a computer included in the disk array device. A procedure for reading from a setting storage unit provided with a plurality of types of configurations as a logical disk of a physical disk according to the intended use, a procedure for receiving an operation command from a host, and data to be written received from the host The data to be written is stored according to the procedure and configuration for temporary storage in the buffer memory. And characterized in that the procedure for writing data to the logical disk, and a response to the operation instruction to execute a step of transmitting to the host apparatus.

  Since the present invention is configured to read and write data according to a plurality of types of configurations as logical disks of physical disks stored in the setting storage unit as described above, a plurality of types suitable for applications and host types are used. Can operate in configuration. As a result, a disk array device, a logical disk control method, and a control program having an excellent feature of being able to operate with an optimal control pattern for a plurality of uses and upper hosts and to be able to operate with a short processing time and a small calculation process are provided. be able to.

It is explanatory drawing shown about the structure of the disk array apparatus which concerns on embodiment of this invention. FIG. 2 is an explanatory diagram showing contents stored in each physical disk (logical disk) shown in FIG. 1. FIG. 2 is an explanatory diagram showing a logical disk control pattern stored in a setting storage unit shown in FIG. 1. 2 is a flowchart illustrating a logical disk control operation performed by a controller illustrated in FIG. 1. 5 is a flowchart for explaining a data writing operation when the operation mode is a “standard mode” in the writing or reading operation for each operation mode shown as step S205 in FIG. 4. FIG. 6 is an explanatory diagram showing an actual operation example of the data write operation of FIG. 5. 5 is a flowchart for explaining a data writing operation when the operation mode is a “backup application mode” in the writing or reading operation for each operation mode shown as step S205 in FIG. 4. FIG. 8 is an explanatory diagram showing an actual operation example of the data write operation of FIG. 7.

(Embodiment)
Hereinafter, the configuration of an embodiment of the present invention will be described with reference to FIG.
First, the basic content of the present embodiment will be described, and then more specific content will be described.
The disk array device 10 according to the present embodiment is a disk array device that operates by being connected to two or more upper hosts 20 and reads / writes data in accordance with operation commands from the upper hosts, and includes a plurality of physical disks. , And a controller 11 that configures a physical disk as a logical disk and reads / writes data to / from the logical disk in response to an operation command from a host. The controller 11 includes an input / output control unit 111a that receives an operation command from the upper host and transmits a response to the operation command to the upper host, and a logical disk control unit 111b that writes the write target data received from the upper host to the logical disk. A setting storage unit 112b that stores a plurality of types of physical disks as logical disks according to the use specified by the host, and also includes a buffer memory unit 112a that temporarily stores data to be written The logical disk control unit 111b writes the data to be written to the logical disk according to this configuration.

  The logical disk control unit 111b has a function of creating parity data for data restoration from data to be written, and writing this parity data to the logical disk together with the data to be written. The setting storage unit 112b stores a plurality of types of configurations for each host.

  Further, the logical disk control unit 111b stores the received write target data in the buffer memory unit, and when the capacity of the data stored in the buffer memory unit exceeds a predetermined block unit capacity, the data is stored. It has a function of writing to a logical disk in a batch.

With the above configuration, the disk array device 10 can operate with an optimal control pattern for each of a plurality of upper hosts.
Hereinafter, this will be described in more detail.

  FIG. 1 is an explanatory diagram showing the configuration of a disk array device 10 according to an embodiment of the present invention. The disk array device 10 is a mass storage device that writes and reads data in accordance with operation commands from a plurality of upper hosts 20a, 20b,... (Hereinafter collectively referred to as upper hosts 20).

  The disk array device 10 is configured by connecting a controller 11 including a control processor and physical disks 12a to 12e which are physical hard disk devices. In FIG. 1, five physical disks 12a to 12e are shown, but this number is arbitrary. The physical disks 12a to 12e constitute a logical disk 120 described later. Further, the number of upper hosts 20 is also arbitrary.

  The controller 11 has a basic computer configuration. That is, the controller 11 includes a processor 111 that is an execution subject of a computer program, and additionally has storage means 112 such as a ROM (Read Only Memory) and a RAM (Random Access Memory) that store data used for processing. Yes. Note that communication means and interfaces necessary for connection with the host 20 or the physical disks 12a to 12e are not described because they are not particularly necessary for explaining the present invention.

  The processor 111 operates as an input / output control unit 111a and a logical disk control unit 111b by operating the control program. Detailed operation of each of these will be described later. The storage unit 112 is referred to as a buffer memory unit 112a used as a temporary storage area for data when reading / writing data from / to the physical disks 12a to 12e, and a setting storage unit 112b for storing settings of a logical disk described later. There is a storage area for each.

  The input / output control unit 111a controls a response transmitted from the upper host 20 to the upper host in response to an operation command (data write request or data read request) to the logical disk 120.

  Based on the control pattern stored in the setting storage unit 112b, the logical disk control unit 111b writes the write data received from the input / output control unit 111a to the logical disk 120 configured by the physical disks 12a to 12e. Also, read data is read from the logical disk 120. At this time, these write data and read data are temporarily stored in the buffer memory unit 112a.

  FIG. 2 is an explanatory diagram showing the contents stored in each of the physical disks 12a to 12e shown in FIG. The physical disks 12a to 12e are set to configure the logical disk 120. The logical disk 120 is set to use at least two of the physical disks 12a to 12e.

  The logical disk control unit 111b divides the data 130 to be written into four blocks of data blocks A to D (130a to 130d), and converts the parity block P130e, which is parity data for maintaining redundancy, to the data blocks A to D. Are recorded on the logical disk 120 as one RAID block 130f. The logical disk control unit 111b continues the same processing for the data 131, 132,. However, the position of the parity block P is sequentially shifted.

  FIG. 3 is an explanatory diagram showing a control pattern of the logical disk 120 stored in the setting storage unit 112b shown in FIG. The control patterns of the logical disk 120 include six control patterns: “standard mode”, “data distribution usage mode”, “backup usage mode”, “database usage mode”, “database LOG usage mode”, and “designation mode”. The control pattern selected in accordance with the use of the upper host is stored in the setting storage unit 112b as the control setting of the logical disk 120.

  Among these, the “standard mode” is a normal logical disk control pattern described later. The “data distribution usage mode” is an operation suitable for distribution of video data and the like, and reserves a larger capacity of the buffer memory unit 112a for storing data to be prefetched from the logical disk 120 than usual and prefetches more data. To work.

  The “backup usage mode” is an operation suitable for backing up a large amount of data. The buffer memory unit 112a for storing data received from the upper host 20 to be written to the logical disk 120 has a larger capacity than usual, and will be described later. Data batch write operation is performed.

  In the “database usage mode”, prefetching of data is prohibited, and the block amount of data to be read from and written to the logical disk 120 is reduced. The “database LOG usage mode” reduces the amount of data to be pre-read by reducing the capacity of the buffer memory unit 112 a that stores data to be pre-read from the logical disk 120, and sets the block amount of data to be read from and written to the logical disk 120. Make it smaller and enable the multi-open function to open multiple files at once.

  In the “designation mode”, the user individually sets the capacity of the buffer memory unit 112a, the block size of data, the validity / invalidity of prefetching, the amount of prefetched data, the validity / invalidity of the multi-open function, etc. This is a possible operation mode.

  Here, these operation modes can be set for each host 20. For example, the disk array device 10 operates in the “backup usage mode” for an operation command from the upper host 20a, and the disk array device 10 operates in the “database usage mode” for an operation command from the upper host 20b. It is possible to set as follows. At that time, the logical drives set for the respective operation modes can be set on separate physical drives.

  FIG. 4 is a flowchart showing the control operation of the logical disk 120 performed by the controller 11 shown in FIG. Receiving the input / output command from the host 20 (step S201), the controller 11 starts the input / output process corresponding thereto.

  First, the input / output control unit 111a determines whether or not the received input / output command is a write process (step S202). If it is a write process (yes in step S202), the received write data is logical disk controlled. The unit 111b stores the data in the buffer memory unit 112a, and the input / output control unit 111a reports the end of the writing process to the host 20 (step S203), and the process proceeds to step S204. If the received input / output command is a read process (NO in step S202), the process directly proceeds to step S204.

  Subsequently, the logical disk control unit 111b reads the setting of the operation mode of the logical disk 120 stored in the setting storage unit 112b, and designates the control method of the logical disk 120 according to this (step S204). Then, the logical disk control unit 111b performs a write or read operation on the logical disk 120 based on the designated control method (step S205).

  Subsequently, the input / output control unit 111a determines whether or not the above-described input / output command is a read process (step S206). If the input process is a read process (Yes in step S206), the logical disk control unit 111b reads it. The data is stored in the buffer memory unit 112a (step S207), the data is read by the input / output control unit 111a and transferred to the host 20 (step S208), and the process is terminated. If the aforementioned input / output command is a write process (No in step S206), the process is terminated as it is.

(Standard mode data write operation)
FIG. 5 is a flowchart for explaining the data writing operation when the operation mode is the “standard mode” in the writing or reading operation for each operation mode shown as step S <b> 205 in FIG. 4.

  When the logical disk control unit 111b receives a request to write data to the logical disk 120 (step S301), first, the data block other than the write target is read in the RAID block to which the data block to be written belongs ( In step S302), parity data is re-created based on the read data (step S303), and write data and re-created parity are written in the target data block and the parity block, respectively (step S304).

  Thereafter, the logical disk control unit 111b determines whether or not all data writing to the target data block has been completed (step S305), and if not completed, repeats the processing of steps S302 to 304. If it is completed, the process ends.

  FIG. 6 is an explanatory diagram showing an actual operation example of the data write operation of FIG. FIG. 6 shows an example in which data write processing for the data blocks A, B, C, and D on the logical disk 120 shown in FIG.

  First, when data write processing for the data block A occurs (step A01), the logical disk control unit 111b stores the write data for the data block A in the buffer memory unit 112a (step A02, step S203 in FIG. 4). Subsequently, every time data write processing for the data blocks B, C, D occurs (steps A03, 05, 07), the write data for these data blocks is stored in the buffer memory unit 112a (steps A04, 06, 08, Step S203 in FIG.

  When the write data of the data blocks A, B, C, and D are completed, the logical disk control unit 111b reads the data of the data blocks B, C, and D excluding the data of the data block A (Step A09, Step S302 in FIG. 5 creates parity data using these data (step A10, step S303 in FIG. 5), and writes write data and parity data for the data block A to the logical disk 120 (step A11, FIG. 5). 5 step S304).

  Thereafter, the data of the data blocks B, C, and D are read out in the same manner as described above, except for the data of other blocks (steps A12, 15, 18 and step S302 in FIG. 5). Parity data is created by using (steps A13, 16, 19 and step S303 in FIG. 5), and write data and parity data for the data block are written to the logical disk 120 (steps A14, 17, 20 and FIG. 5). Step S304).

  That is, every time data of one data block is written, parity data is recreated and written to the same parity block. This is not efficient because re-creation of parity data occurs many times.

(Operation of writing data in backup usage mode)
FIG. 7 is a flowchart for explaining the data write operation when the operation mode is the “backup application mode” in the write or read operation for each operation mode shown as step S205 in FIG.

  When the logical disk control unit 111b receives a request for data write processing to the logical disk 120 (step S401), first, does the amount of data subject to data write processing exceed the amount of RAID block units (data A to D)? It is determined whether or not (Step S402), and if not exceeded (No in Step S402), the process proceeds to Step S406, a normal writing process is performed on the data (Step S406), and the process is terminated.

  If the amount of data to be written, which is stored in the buffer memory unit 112a, exceeds the amount of RAID block units (data A to D) (Yes in step S402), parity data is created with data of RAID block units. In step S403, the data in units of RAID blocks and the parity data created in step S404 are written to the logical disk 120 (step S404).

  Then, it is determined whether or not data that could not be processed in units of RAID blocks remains in the buffer memory unit 112a (step S405). If not (step S405 is no), the processing is terminated and remains. If so (step S405 is YES), the process proceeds to step S406, the normal writing process is performed on the data (step S406), and the process is terminated.

  FIG. 8 is an explanatory diagram showing an actual operation example of the data write operation of FIG. Similar to FIG. 6, FIG. 8 also shows an example in which data write processing for data blocks A, B, C, and D on the logical disk 120 shown in FIG.

  First, when data write processing for the data block A occurs (step B01), since step S402 in FIG. 7 is no, the logical disk control unit 111b stores the write data for the data block A in the buffer memory unit 112a (step B02, FIG. 7 step S406).

  Subsequently, whenever data write processing for the data blocks B, C, D occurs (steps B03, 05, 07), the write data for these data blocks is stored in the buffer memory unit 112a in the same manner (steps B04, 06). , 08, step S406 in FIG.

  When the write data of the data blocks A, B, C, and D are stored in the buffer memory unit 112a, the capacity of the data stored in the buffer memory unit 112a exceeds the amount in units of RAID blocks, and step S402 is performed. Become Jesus. That is, the data for each RAID block is prepared.

  The logical disk control unit 111b reads the write data of the data blocks A, B, C, and D from the buffer memory unit 112a, and creates parity data using these data (step B09, step S403 in FIG. 7). These write data are respectively written in the corresponding blocks of the logical disk 120 (step B10, step S404 in FIG. 7). As a result, the buffer memory unit 112a is emptied (No in step S405), and the process is terminated.

  That is, in the operation of the “standard mode” described with reference to FIG. 6, the writing operation of the data blocks A, B, C, and D to the logical disk 120 requires 20 steps. Although the same operation has been performed 8 times, the same operation can be performed in 10 steps in the “backup use mode” described in FIG. 8, and data blocks A, B, C, D and parity data are written to the logical disk 120. That is, it is only necessary to write five times.

  The difference in operation between the “standard mode” and the “backup usage mode” has been described above. As described above, the disk array device 10 according to the present embodiment can save processing time and calculation processing by performing an operation suitable for the application according to the control pattern stored in the setting storage unit 112b.

(Overall operation of the first embodiment)
Next, the overall operation of the above embodiment will be described.
The logical disk control method according to the present embodiment includes a plurality of physical disks, and a controller that configures the physical disks as logical disks and reads / writes data from / to the logical disks in accordance with operation commands from the host. The disk array device 10 that operates while connected to the above host and reads / writes data in accordance with an operation command from the host, and has a plurality of types of configuration storage as a physical disk logical disk Are stored in advance, the operation command from the host is received by the input / output control unit, and the write target data received from the host is temporarily stored in the buffer memory unit provided (FIG. 4, steps S203 and 207). ), The logical disk control unit writes the data to be written to the logical disk according to the configuration (FIG. 4, step S2). 5,207), input-output control unit a response to operation instruction sent to the higher-level host (Fig. 4, step S203,208).

Here, each of the above-described operation steps may be programmed to be executable by a computer, and may be executed by the controller 11 that directly executes each of the steps. The program may be recorded on a non-temporary recording medium, such as a DVD, a CD, or a flash memory. In this case, the program is read from the recording medium by a computer and executed.
By this operation, this embodiment has the following effects.

  The disk array device 10 according to the present embodiment can save processing time and calculation processing by performing an operation suitable for the application according to the control pattern stored in the setting storage unit 112b. As a result, it is possible to obtain specific effects such as reducing the load inside the apparatus and improving the performance with the host. A plurality of types of control patterns can be set according to the application, the host, and the like, and the disk array apparatus 10 can easily be operated differently according to the setting.

  Note that the control pattern may be switched according to a plurality of upper hosts, and even the same upper host is switched by software (for example, database, backup, etc.) that operates the disk array device. May be.

  The present invention has been described with reference to the specific embodiments shown in the drawings. However, the present invention is not limited to the embodiments shown in the drawings, and any known hitherto provided that the effects of the present invention are achieved. Even if it is a structure, it is employable.

  Regarding the embodiment described above, the main points of the new technical contents are summarized as follows. In addition, although part or all of the said embodiment is summarized as follows as a novel technique, this invention is not necessarily limited to this.

(Appendix 1) A disk array device that operates while connected to two or more upper hosts, and reads / writes data in response to an operation command from the upper host,
A plurality of physical disks, and a controller configured to read and write data to and from the logical disk in response to an operation command from the upper host by configuring the physical disk as a logical disk,
The controller is
An input / output control unit that receives the operation command from the upper host and transmits a response to the operation command to the upper host; and a logical disk control unit that writes the write target data received from the upper host to the logical disk. And a buffer memory unit for temporarily storing the write target data,
A setting storage unit that stores in advance a plurality of types of configurations of the physical disk as the logical disk according to the application specified by the upper host is provided,
The disk array device, wherein the logical disk control unit writes the data to be written to the logical disk according to this configuration.

(Supplementary Note 2) The logical disk control unit has a function of creating parity data for data restoration from the write target data and writing the parity data to the logical disk together with the write target data. The disk array device according to appendix 1.

(Supplementary note 3) The disk array device according to supplementary note 1, wherein the setting storage unit stores a plurality of types of the configurations for each of the host hosts.

(Supplementary Note 4) The logical disk control unit
The received data to be written is stored in the buffer memory unit, and when the capacity of the data stored in the buffer memory unit exceeds a predetermined block unit capacity, the data is collectively stored in the logical disk. 2. The disk array device according to appendix 1, which has a writing function.

(Supplementary Note 5) Two or more upper hosts comprising a plurality of physical disks and a controller that configures the physical disks as logical disks and reads / writes data to / from the logical disks in accordance with operation commands from the upper hosts Connected to the disk array device, and reads and writes data in response to an operation command from the host,
Store in advance in a setting storage unit provided with a plurality of types of the physical disk as the logical disk,
The input / output control unit receives the operation command from the upper host,
Temporarily storing the data to be written received from the upper host in a buffer memory unit provided with,
The logical disk control unit writes the data to be written to the logical disk according to the configuration,
The logical disk control method, wherein the input / output control unit transmits a response to the operation command to the host.

(Appendix 6) Two or more upper hosts comprising a plurality of physical disks and a controller that configures the physical disks as logical disks and reads / writes data to / from the logical disks in accordance with operation commands from the upper hosts Connected to the disk array device, and reads and writes data in response to an operation command from the host,
In the computer provided in the disk array device,
A procedure of reading from a setting storage unit having a plurality of types of configurations of the physical disk as the logical disk,
A procedure for receiving the operation command from the host;
A procedure for temporarily storing data to be written received from the host host in a buffer memory unit provided;
A procedure for writing the data to be written to the logical disk according to the configuration;
And a logical disk control program for executing a procedure for transmitting a response to the operation command to the host.

  The present invention is widely applicable to disk array devices having a parity type RAID. In particular, it is suitable for a disk array device shared by a plurality of upper hosts.

DESCRIPTION OF SYMBOLS 10 Disk array apparatus 11 Controller 12a-e Physical disk 20, 20a ... Upper host 111 Processor 111a Input / output control part 111b Logical disk control part 112 Storage means 112a Buffer memory part 112b Setting storage part 120 Logical disk

Claims (6)

A disk array device that operates by being connected to two or more upper hosts, and that reads and writes data in accordance with operation commands from the upper hosts,
A plurality of physical disks, and a controller configured to read and write data to and from the logical disk in response to an operation command from the upper host by configuring the physical disk as a logical disk,
The controller is
An input / output control unit that receives the operation command from the upper host and transmits a response to the operation command to the upper host; and a logical disk control unit that writes the write target data received from the upper host to the logical disk. And a buffer memory unit for temporarily storing the write target data,
A setting storage unit that stores in advance a plurality of types of configurations of the physical disk as the logical disk according to the application specified by the upper host is provided,
The disk array device, wherein the logical disk control unit writes the data to be written to the logical disk according to this configuration.   The logical disk control unit has a function of creating parity data for data restoration from the data to be written and writing the parity data to the logical disk together with the data to be written. The disk array device described in 1.   2. The disk array device according to claim 1, wherein the setting storage unit stores a plurality of types of the configurations for each of the host hosts. The logical disk controller is
The received data to be written is stored in the buffer memory unit, and when the capacity of the data stored in the buffer memory unit exceeds a predetermined block unit capacity, the data is collectively stored in the logical disk. 2. The disk array device according to claim 1, which has a writing function. A plurality of physical disks and a controller that configures the physical disks as logical disks and reads / writes data to / from the logical disks in response to an operation command from the upper host, and is connected to two or more upper hosts In the disk array device that operates and reads / writes data according to an operation command from the host,
Store in advance in a setting storage unit provided with a plurality of types of configurations as the logical disk of the physical disk according to the application specified by the upper host,
The input / output control unit receives the operation command from the upper host,
Temporarily storing the data to be written received from the upper host in a buffer memory unit provided with,
The logical disk control unit writes the data to be written to the logical disk according to the configuration,
The logical disk control method, wherein the input / output control unit transmits a response to the operation command to the host. A plurality of physical disks and a controller that configures the physical disks as logical disks and reads / writes data to / from the logical disks in response to an operation command from the upper host, and is connected to two or more upper hosts In the disk array device that operates and reads / writes data according to an operation command from the host,
In the computer provided in the disk array device,
A procedure of reading from a setting storage unit provided with a plurality of types of configurations as the logical disk of the physical disk according to the application specified by the upper host,
A procedure for receiving the operation command from the host;
A procedure for temporarily storing data to be written received from the host host in a buffer memory unit provided;
A procedure for writing the data to be written to the logical disk according to the configuration;
And a logical disk control program for executing a procedure for transmitting a response to the operation command to the host.

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