JP2003241904A5

JP2003241904A5 -

Info

Publication number: JP2003241904A5
Application number: JP2002039208A
Authority: JP
Filing date: 2002-02-15
Publication date: 2005-05-26

Claims

In a disk array device having a plurality of disk devices and a control device for controlling these disk devices and connected to an external device,
The controller is
Request accepting means for accepting a request from the external device;
In response to the received request, formatting means for executing formatting processing on the disk device;
Reading means for executing a data reading process in response to the received request;
Writing means for executing a data writing process in response to the received request;
A writing history management table for recording the history of execution of the writing process in units of blocks for the disk device;
The formatting means refers to the write history management table to check the presence / absence of the write process for the block to be formatted, and does not execute the format process on the write-processed block, while the write process has been completed. The format process is performed only on the blocks that are not, and the history that the write process has been performed on the blocks that have been formatted in the write history management table is recorded,
In the execution state of the formatting means, when the request accepting means accepts an execution request for the read process and / or the write process from the external device, the read means and / or the write means store the write history management table. Referring to the disk array apparatus, the disk array apparatus accesses the disk array apparatus and executes the read process and / or the write process on the block only when the corresponding block has been subjected to the write process.

A cache memory for temporarily storing data, and when the request processing unit receives the read processing execution request from the external device in the execution state of the formatting unit, the reading unit stores the write history management table. Referring to, when the read destination block is not already written, the predetermined data is generated and stored in the cache memory, and the data in the cache memory is transmitted to the external host device. The disk array device according to claim 1 .

A cache memory for temporarily storing data; and in the execution state of the formatting means, when the request receiving means receives the execution request for the write process from the external device, the writing means stores the write history management table If the write destination block is not already written, the write data transmitted from the external device is stored in the cache memory, and the write process is executed for the block in the write history management table. 2. The disk array device according to claim 1, wherein a history to be recorded is recorded.

When the request accepting unit accepts the execution request for the formatting process from the external device, the formatting unit reports the completion of the formatting process to the external device before executing the actual formatting process for the disk device. 4. The disk array device according to claim 1, wherein the disk array device is executed.

A method of controlling a disk array device having a plurality of disk devices and connected to an external device,
Upon receiving a format process execution request from the external device, referring to the write history management table that records the history of the write process in units of blocks, confirms the presence or absence of data write process for the corresponding block,
As a result of the confirmation, the format process is not performed on the block that has been subjected to the write process, while the format process is performed only on the block that has not been subjected to the write process, and the format in the write history management table Record the history that the writing process has been executed for the processed block,
When an execution request for a read process and / or the write process is received from the external device in the execution state of the format process, the write history management table is referred to, and only when the write process has been completed for the corresponding block, A method for controlling a disk array device, comprising: accessing a disk array device to execute the read process and / or the write process on the block.

The disk array device includes a cache memory for temporarily storing data. When the execution request for the read process is received from the external device in the execution state of the format process, the disk array apparatus refers to the write history management table, and 6. The block according to claim 5, wherein if the write processing has not been completed for a block, predetermined data is generated and stored in the cache memory, and the data in the cache memory is transmitted to the external host device. Method for controlling the disk array device of the present invention.

The disk array device includes a cache memory for temporarily storing data, and when the request processing unit receives the write processing execution request from the external device in the format processing execution state, the write history management table is stored. If the write processing has not been completed for the corresponding block, the write data transmitted from the external device is stored in the cache memory, and the write processing has been executed for the block in the write history management table The control method according to claim 5, wherein the history is recorded.

When the request accepting unit accepts the execution request for the formatting process from the external device, the formatting unit reports the completion of the formatting process to the external device before executing the actual formatting process for the disk device. 8. The disk array device control method according to claim 5, wherein the disk array device control method is executed.

A magnetic disk device having a plurality of magnetic disks, and a disk controller for controlling the magnetic disk device;
  The disk controller is
  A host channel control unit that is connected to a host device and receives requests such as data read requests and write requests;
  Cache memory,
  A processor, a control memory, and a formatting unit, a reading unit, and a writing unit, which are realized by the processor operating based on control data and a control program stored in the control memory. A middle control unit for storing in the control memory a write history management table that records the executed history in block units;
With
  Upon receiving a format request from the host device, the formatting means reports the end of the formatting process to the host device, and then confirms the presence or absence of the writing process for the block to be formatted with reference to the writing history management table The format process is not performed on the block that has been subjected to the write process, while the format process is performed on the block that has not been subjected to the write process. Record in the write history management table,
  When the host channel control unit accepts the read request from the host device in the format processing execution state, the read unit corresponds to the host device from the cache memory when the corresponding data exists in the cache memory. If the corresponding data does not exist in the cache memory, the write history management table is referred to. If the corresponding block has been written, the corresponding data is transferred from the magnetic disk to the cache memory. Read the data into the memory, transfer the corresponding data from the cache memory to the host device, and if the corresponding block is not already written, create predetermined data in the cache memory and Sending the predetermined data to the device;
  When the host channel control unit accepts the write request from the host device in the execution state of the format process, the writing unit refers to the write history management table, and when the corresponding block has been written. , Access the magnetic disk and execute a write process on the block. If the corresponding block is not already written, the format data of the entire block is generated and stored in the cache memory. In the corresponding area of the cache memory in which the format data is stored, the write data received from the host device is stored, and a history that the block has been written is recorded in the write history management table, and the magnetic disk Against the block To execute the writing process
A disk array device characterized by that.