Storage control apparatus and non-transitory computer-readable storage medium for storing storage control program

Patent metadata

Field	Value
Publication number	US-2020409575-A1
Application number	US-202016910133-A
Country	US
Kind code	A1
Filing date	Jun 24, 2020
Priority date	Jun 27, 2019
Publication date	Dec 31, 2020
Grant date	—

Abstract

A storage control apparatus configured to be coupled to a redundant configuration including a first and second storage devices, the storage control apparatus includes: a memory; and processing circuitry coupled to the memory, the processing circuitry being configured to execute a first processing that includes dealing with access to any of the first and second storage devices from a higher-level apparatus; and execute a second processing that includes converting an access destination of the access such that each same physical position in the first and second storage devices corresponds to a first logical address for a first storage device and a second logical address for the second storage device, the first logical address being a logical address different from the second logical address.

First claim

What is claimed is:

1 . A storage control apparatus configured to be coupled to a redundant configuration including a first and second storage devices, the storage control apparatus comprising:
a memory; and processing circuitry coupled to the memory, the processing circuitry being configured to execute a first processing that includes dealing with access to any of the first and second storage devices from a higher-level apparatus; and execute a second processing that includes converting an access destination of the access such that each same physical position in the first and second storage devices corresponds to a first logical address for a first storage device and a second logical address for the second storage device, the first logical address being a logical address different from the second logical address.

2 . The storage control apparatus according to claim 1 ,
wherein the memory is configured to store a shift amount for a logical address in the second storage device relative to the first storage device, wherein the converting of the access destination is configured to obtain the second logical address by shifting a third logical address by the shift amount stored in the memory, the third logical address being a logical address indicated by the access from the higher-level apparatus.

3 . The storage control apparatus according to claim 2 ,
wherein the memory is configured to store a plurality of the shift amounts differing from each other for a plurality of the second storage devices, respectively.

4 . The storage control apparatus according to claim 2 ,
wherein the memory is configured to store an integer multiple of the number of logical blocks contained in one surface of a magnetic disk included in each of the first and second storage devices as the shift amount.

5 . The storage control apparatus according to claim 2 , wherein when the first and second storage devices have a same number S of logical blocks, the number of logical blocks in one surface of a magnetic disk is F, a predetermined integer n is given, the shift amount is G=n×F, and a modulo operation MOD is given,
the converting of the access destination is configured to
set a logical address M as the first logical address for the first storage device,
convert the logical address M into MOD(M+G, S), and
set the MOD(M+G, S) as the second logical address for the second storage device.

6 . A non-transitory computer-readable storage medium for storing a storage control program configured to cause a computer to execute processing, the computer being configured to be coupled to a redundant configuration including a first and second storage devices, the processing comprising:
executing a first processing that includes dealing with access to any of the first and second storage devices from a higher-level apparatus; and executing a second processing that includes converting an access destination of the access such that each same physical position in the first and second storage devices corresponds to a first logical address for a first storage device and a second logical address for the second storage device, the first logical address being a logical address different from the second logical address.

7 . The non-transitory computer-readable storage medium according to claim 6 ,
wherein the memory is configured to store a shift amount for a logical address in the second storage device relative to the first storage device, wherein the converting of the access destination is configured to obtain the second logical address by shifting a third logical address by the shift amount stored in the memory, the third logical address being a logical address indicated by the access from the higher-level apparatus.

8 . The non-transitory computer-readable storage medium according to claim 7 ,
wherein the memory is configured to store a plurality of the shift amounts differing from each other for a plurality of the second storage devices, respectively.

9 . The non-transitory computer-readable storage medium according to claim 7 ,
wherein the memory is configured to store an integer multiple of the number of logical blocks contained in one surface of a magnetic disk included in each of the first and second storage devices as the shift amount.

10 . The non-transitory computer-readable storage medium according to claim 7 ,
wherein when the first and second storage devices have a same number S of logical blocks, the number of logical blocks in one surface of a magnetic disk is F, a predetermined integer n is given, the shift amount is G=n×F, and a modulo operation MOD is given, the converting of the access destination is configured to
set a logical address M as the first logical address for the first storage device,
convert the logical address M into MOD(M+G, S), and
set the MOD(M+G, S) as the second logical address for the second storage device.

Assignees

• Fujitsu Ltd

Inventors

• Kodama Naoto
• Yamamoto Yuuki
• Kaneko Tadashi

Classifications

• G06F3/167

  Audio in a user interface, e.g. using voice commands for navigating, audio feedback · CPC title

• G06F3/065

  Replication mechanisms · CPC title

• G06F3/0689

  Disk arrays, e.g. RAID, JBOD · CPC title

• G06F3/0619 Primary

  in relation to data integrity, e.g. data losses, bit errors · CPC title

• G06F3/0659

  Command handling arrangements, e.g. command buffers, queues, command scheduling · CPC title