Title:
STORAGE APPARATUS AND ITS CONTROL METHOD
Document Type and Number:
WIPO Patent Application WO/2013/076782
Kind Code:
A1
Abstract:
A storage apparatus and its control method capable of obtaining more snapshots is suggested. A controller for the storage apparatus: creates a second logical volume in a storage area provided by one or more storage devices; stores management information of a snapshot of a first logical volume, which is to be provided to a host computer, in the second logical volume; and reads the management information of a necessary snapshot from the second logical volume to a memory when needed, executes processing using the read management information, and returns the management information, which becomes no longer necessary, from the memory to the second logical volume. When reading the management information of the necessary snapshot from the second logical volume to the memory when needed, the controller changes the number of generations and address range of the snapshot of the management information to be read to the memory according to a generation and address of the snapshot whose management information is required.
Inventors:
OHARA MASAYOSHI (JP)
NAGATA KOJI (JP)
SAKAI KOSUKE (JP)
NAGATA KOJI (JP)
SAKAI KOSUKE (JP)
Application Number:
PCT/JP2011/006577
Publication Date:
May 30, 2013
Filing Date:
November 25, 2011
Export Citation:
Assignee:
HITACHI LTD (JP)
OHARA MASAYOSHI (JP)
NAGATA KOJI (JP)
SAKAI KOSUKE (JP)
OHARA MASAYOSHI (JP)
NAGATA KOJI (JP)
SAKAI KOSUKE (JP)
International Classes:
G06F3/06
Foreign References:
| US7849057B1 | 2010-12-07 | |||
| US20090327357A1 | 2009-12-31 | |||
| EP1645960A1 | 2006-04-12 | |||
| JP2006113667A | 2006-04-27 |
Attorney, Agent or Firm:
OHGA, Shinji et al. (Seafort Square Center Building 16F, 2-3-12, Higashishinagawa, Shinagawa-k, Tokyo 02, JP)
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Claims: