Method for restoring snapshot in a storage system

Details Method for restoring snapshot in a storage system Method for restoring snapshot in a storage system

2006-01-13

2008-10-14

McCarthy, Christopher S (Department: 2113)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

C711S162000

Reexamination Certificate

active

07437603

ABSTRACT:
Provided is a technique which solves a problem of a long-time reduction in a service level after service restoration and a problem of a failure caused by a disk capacity shortage during primary volume restoration. According to the technique, reference is made to a differential block management unit (217) setting which of a differential volume (142) and a primary volume (141) a data block of a restoring source snapshot volume (VVOL No.3) is to determine which of the primary volume (141) and the differential volume (142) a volume storing read data is. When a restoring target data block is in a differential volume (142), data of the differential volume (142) is restored in the primary volume (141). Upon accessing to the primary volume (141) while restoring, switching is made to a virtual primary volume after restoration where data of the primary and differential volumes are combined based on the snapshot volume (VVOL No.3) to execute accessing.

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