Data storage systems, methods and networks having a snapshot...

Details Data storage systems, methods and networks having a snapshot... Data storage systems, methods and networks having a snapshot...

2011-08-02

2011-08-02

Patel, Kaushikkumar (Department: 2186)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C707S639000, C707S649000

Reexamination Certificate

active

07991973

ABSTRACT:
A data storage system includes a storage device divided into a plurality of blocks for storing data for a plurality of volumes, and a processor to execute instructions for maintaining a block map corresponding to the data stored on the storage device. The storage system may be part of a storage system network. The block map stores reference data indicating which of the volumes reference which blocks on the storage device, and which blocks on the storage device are unallocated. The reference data may include, for groups of one or more blocks, a first value identifying the oldest volume in which the group of blocks was allocated and a second value identifying the newest volume in which the group of blocks was allocated. The volumes may include one or more snapshots.

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