Method for keeping snapshot image in a storage system

Details Method for keeping snapshot image in a storage system Method for keeping snapshot image in a storage system

2004-12-16

2008-07-08

Peikari, B. James (Department: 2189)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

C714S006130, C714S005110, C711S162000

Reexamination Certificate

active

07398420

ABSTRACT:
A technique for realizing a snapshot function is provided, which can reduce data transfer between a server system and a storage subsystem which is necessary during data copy operations between storage devices and reduce the degradation of data access performance of the storage device in operation. In a storage system, a command processed by a CPU of a storage subsystem includes a COPY and WRITE command for performing a data copy process and a data storage process in accordance with a predetermined sequence, and a server system issues the command to the storage subsystem. After receiving the command, the storage subsystem executes a data copy process from a first disk drive to a second disk drive, and subsequently executes a data storage process to the first disk drive, thereby keeping a snapshot of the data stored in the first disk drive.

REFERENCES:
patent: 5835953 (1998-11-01), Ohran
patent: 6473775 (2002-10-01), Kusters et al.
patent: 6618794 (2003-09-01), Sicola et al.
patent: 2003/0140070 (2003-07-01), Kaczmarski et al.
patent: 2004-118413 (2004-04-01), None

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