Data storage system having mata bit maps for indicating whether data blocks are invalid in snapshot copies
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United States of America Patent
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Sep 14, 2004
Grant Date -
Feb 12, 2004
app pub date -
Aug 6, 2002
filing date -
Aug 6, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
In a data storage system providing access to a production dataset and snapshot copies of the production dataset, a production meta bit map identifies blocks of storage that are invalid in the production dataset. If a block in the production dataset is invalid when a snapshot copy is being made, then there is no need to copy the block to storage for the snapshot before writing to the block. Moreover, if a block in the production dataset supporting a snapshot copy is dynamically invalidated, it may be kept in the production dataset until it is written to. For this purpose, a respective snapshot copy of the meta bit map is made and kept with each of the snapshot datasets, and the snapshot copies of the meta bit map are merged in order to indicate the blocks that are invalid for all of the snapshots.
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