Storage system and storage method

• US 10,642,705 B2
• Filed: 01/07/2019
• Issued: 05/05/2020
• Est. Priority Date: 01/15/2018
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Furuya, Masanori
• Primary Examiner(s): Sun, Michael
• Application Number:
  US16/241,289
• Publication Number:
  US 20190220375A1
• Time in Patent Office: 484 Days
• Field of Search: None
• CPC Class Codes: G06F 11/0727 in a storage system, e.g. in a DASD or network based storage system drivers for digital recording or reproducing units G06F3/06; circuits for error detection or correction within digital recording or reproducing units G11B20/18; for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS], H04L67/1097
• CPC Class Codes: G06F 11/0757 by exceeding a time limit, i.e. time-out, e.g. watchdogs
• CPC Class Codes: G06F 11/0793 Remedial or corrective actions recovery from an exception in an instruction pipeline G06F9/3861; by retry G06F11/1402; for recovering from a failure of a protocol instance or entity H04L69/40
• CPC Class Codes: G06F 11/1658 Data re-synchronization of a redundant component, or initial sync of replacement, additional or spare unit
• CPC Class Codes: G06F 11/201 between storage system components
• CPC Class Codes: G06F 11/2071 using a plurality of controllers
• CPC Class Codes: G06F 11/2094 Redundant storage or storage space G06F11/2056 takes precedence
• CPC Class Codes: G06F 13/10 Program control for peripheral devices G06F13/14 - G06F13/42 take precedence
• CPC Class Codes: G06F 3/0619 in relation to data integrity, e.g. data losses, bit errors

Abstract

A storage system includes a first memory, and a processor configured to calculate a first number of accesses from a first server to the first memory and a second number of accesses from a second server to the first memory, detect switching from the first server to the second server in accordance with the first number and the second number, determine whether a first site in which the first memory is disposed and a second site in which the second server is disposed are different on the basis of location information that represents a location relationship between the first memory and the second server, and perform a change of an access destination of the second server to a second memory disposed in the second site when the first site and the second site are different.

Claims

1. A storage system comprising:

a first memory; and

a processor coupled to the first memory and the processor configured to

calculate a first number of accesses through a first network using a first communication protocol from a first server to the first memory and a second number of accesses through a second network using a second communication protocol from a second server to the first memory, the first communication protocol being different from the second communication protocol,

detect switching from the first server to the second server in accordance with the first number and the second number,

determine whether a first site in which the first memory is disposed and a second site in which the second server is disposed are different on the basis of location information that represents a location relationship between the first memory and the second server, and

perform a change of an access destination of the second server to a second memory disposed in the second site when the first site and the second site are different.

2. The storage system according to claim 1, wherein the switching is detected when the second number is larger than the first number.

3. The storage system according to claim 1, wherein

the first memory includes a first group obtained by grouping storage areas, the first group being an access destination of the first server and the second server,

the second memory includes a second group obtained by grouping storage areas, and

the change includes changing the access destination of the second server from the first group to the second group.

4. The storage system according to claim 1, wherein the processor is configured to execute mirroring processing from the first memory to the second memory before the change is performed.

5. The storage system according to claim 1, wherein mirroring processing from the second memory to the first memory is executed after the change is performed.

6. A computer-implemented storage method comprising:

calculating a first number of accesses through a first network using a first communication protocol from a first server to the first memory and a second number of accesses through a second network used a second communication protocol from a second server to the first memory, the first communication protocol being different from the second communication protocol;

detecting switching from the first server to the second server in accordance with the first number and the second number;

determining whether a first site in which the first memory is disposed and a second site in which the second server is disposed are different on the basis of location information that represents a location relationship between the first memory and the second server; and

changing an access destination of the second server to a second memory disposed in the second site when the first site and the second site are different.

7. The storage method according to claim 6, wherein the switching is detected when the second number is larger than the first number.

8. The storage method according to claim 6, wherein

the first memory includes a first group obtained by grouping storage areas, the first group being an access destination of the first server and the second server,

the second memory includes a second group obtained by grouping storage areas, and

the change includes changing the access destination of the second server from the first group to the second group.

9. The storage method according to claim 6, wherein mirroring processing from the first memory to the second memory is executed before the changing is performed.

10. The storage system according to claim 7, wherein mirroring processing from the second memory to the first memory is executed after the changing is performed.

11. A non-transitory computer-readable medium storing instructions executable by one or more computer, the instructions comprising:

one or more instructions for calculating a first number of accesses through a first network using a first communication protocol from a first server to the first memory and a second number of accesses through a second network using a second communication protocol from a second server to the first memory, the first communication protocol being different from the second communication protocol;

one or more instructions for detecting switching from the first server to the second server in accordance with the first number and the second number;

one or more instructions for determining whether a first site in which the first memory is disposed and a second site in which the second server is disposed are different on the basis of location information that represents a location relationship between the first memory and the second server; and

one or more instructions for changing an access destination of the second server to a second memory disposed in the second site when the first site and the second site are different.