Logical volume data structure determining configuration status of logical volume based on comparing values of examined volume epoch identifiers on each on-line extent
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United States of America Patent
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May 11, 2004
Grant Date -
Sep 18, 2003
app pub date -
Mar 17, 2003
filing date -
Nov 29, 1999
priority date (Note) -
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Abstract
Volume configuration data management systems and methods are described. A logical volume provider maintains an epoch number on each of the extents comprising a volume. Upon each change in the configuration of the volume, the epoch number on each of the currently online extents is updated. When a volume is discovered and a request is made to bring the volume online, the logical volume provider can compare the epoch numbers on the extents to determine if the volume data is consistent across each of the extents, or if an extent contains stale data due to a transitory outage.
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