Title:
METHOD FOR MANAGING SNAPSHOT AND COMPUTER SYSTEM
Document Type and Number:
Japanese Patent JP3868708
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To manage a snapshot without increasing the CPU load of a computer and the communication quantity of data due to the duplex processing of data writing by evading the concentration of load onto a specific medium in backup operation.
SOLUTION: When a snapshot is not taken, data writing from the computer to an external storage device 410 is duplicated and stored in respective areas of plural different storage media 420, 421. The duplication of data writing is performed by the external storage device 410. In the ease of taking a snapshot of external storage, one area out of the duplicated areas is provided as a storage area for a normal access and the other area is provided as a snapshot area. When the normal access storage area is updated during the storage of the snapshot, the computer allows the contents of the two areas to coincide with each other at the time of deleting the snapshot.
Inventors:
Yasuyuki Amimatsu
Naoto Matsunami
Kenji Muraoka
Takashi Oeda
Ikuya Yagisawa
Naoto Matsunami
Kenji Muraoka
Takashi Oeda
Ikuya Yagisawa
Application Number:
JP2000118012A
Publication Date:
January 17, 2007
Filing Date:
April 19, 2000
Export Citation:
Assignee:
株式会社日立製作所
International Classes:
G06F12/16; G06F3/06; G06F11/14; G06F13/00; G11B20/10; (IPC1-7): G06F12/16; G06F3/06; G06F13/00; G11B20/10
Domestic Patent References:
| JP7160563A | ||||
| JP6266625A | ||||
| JP9231016A |
Attorney, Agent or Firm:
Kenjiro Take
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