Data storage systems, methods and networks having a snapshot efficient block map
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United States of America Patent
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Aug 2, 2011
Grant Date -
Nov 5, 2009
app pub date -
May 5, 2008
filing date -
May 5, 2008
priority date (Note) -
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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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