Mapping structure for maintaining metadata for snapshots in a virtualized storage environment
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United States of America Patent
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Aug 18, 2020
Grant Date -
Nov 9, 2017
app pub date -
Jul 26, 2017
filing date -
Aug 10, 2011
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Abstract
A method for maintaining a mapping structure for maintaining metadata for snapshots in a virtualized storage environment, includes taking a snapshot of a virtual disk, generating an entry in a metadata structure for the snapshot, wherein the entry includes metadata for blocks in the snapshot that have been modified since a preceding snapshot and lazily generating an entry in the mapping structure for the snapshot, wherein the entry includes values for each block in the snapshot, wherein a value for a block indicates a presence of metadata in the metadata structure for the block or an absence of metadata in the metadata structure for the block.
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