Data reallocation among storage systems

• US 20070266216A1
• Filed: 07/17/2007
• Published: 11/15/2007
• Est. Priority Date: 07/06/2000
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Mogi, Kazuhiko, Arakawa, Hiroshi, Eguchi, Yoshiaki, Arai, Kouji
• Granted Patent: US 7,953,949 B2
• Time in Patent Office: Days
• US Class Current: 711/165
• CPC Class Codes: G06F 11/1096 Parity calculation or recalculation after configuration or reconfiguration of the system
• CPC Class Codes: G06F 11/2087 with a common controller
• CPC Class Codes: G06F 12/0866 for peripheral storage systems, e.g. disk cache
• CPC Class Codes: G06F 3/0605 by facilitating the interaction with a user or administrator
• CPC Class Codes: G06F 3/0608 Saving storage space on storage systems
• CPC Class Codes: G06F 3/0613 in relation to throughput
• CPC Class Codes: G06F 3/0631 by allocating resources to storage systems
• CPC Class Codes: G06F 3/0635 by changing the path, e.g. traffic rerouting, path reconfiguration
• CPC Class Codes: G06F 3/0647 Migration mechanisms
• CPC Class Codes: G06F 3/0659 Command handling arrangements, e.g. command buffers, queues, command scheduling
• CPC Class Codes: G06F 3/067 Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]
• CPC Class Codes: H04L 61/457 containing identifiers of data entities on a computer, e.g. file names
• CPC Class Codes: Y10S 707/99953 Recoverability
• CPC Class Codes: Y10S 707/99955 Archiving or backup

Abstract

The present invention provides techniques, including a method and system, for relocating data between storage systems. In one embodiment of the present invention a host collects usage information from a plurality of storage systems, and determines the relocation destination LU for data stored in the LU to be relocated. The host alters an LU logical position name table that determines matching between the logical position names of data and LUs. It also carries out data relocation between storage subsystems by shifting data stored in an origin LU to be relocated to a destination LU. In another embodiment relocation of files is provided.

Claims

1. A computer system comprising:

a computer;

a plurality of storage systems including first storage device and a second storage device,

a network coupled with the computer and the first storage device and the second storage device;

wherein the computer is configured to copy data stored in the first storage device to the second storage device,

wherein the computer is configured to change the destination of an access request designating the first storage device to be the second storage device, after data stored in the first storage device is copied to the second storage device.

2. A computer system according to claim 1:

wherein the computer includes an application, a file system, and a manager;

wherein the manager instructs the file system to lock the first storage device, and the file system suspends acceptance of any request to read/write from or into the first storage device.

3. A computer system according to claim 2:

wherein the manager instructs the file system to invalidate the cache with respect to the first storage device and the file system invalidates any data to be stored in the first storage device but cache in the memory on the computer.

4. A computer system according to claim 3:

wherein the manager instructs the second storage device to copy data from the first storage device;

wherein the second storage device starts copy processing and notifies the manager of the receipt of the copy instruction.

5. A computer system according to claim 4:

wherein the manager rewrites a first table to be used by the file system to access the first storage device and the second storage device, and exchanges mappings of the first storage device and of the second storage device with each other.

6. A computer system according to claim 5:

wherein the file system reads data from or writes data into the second storage device.