Cascading support for mirrored volumes
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United States of America Patent
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May 3, 2005
Grant Date -
N/A
app pub date -
Mar 29, 2001
filing date -
Mar 29, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
Propagation of data by mirroring the data from a first filer to a second filer, and then mirroring the data from the second filer to a third filer. More generally, propagating data by mirroring the data along a chain or cascade of mirrors. Snapshots are used in mirroring the data. Preferably, the data is organized in one or more volumes on the filer, and one or more of the volumes are mirrored. Deletion is prevented of a snapshot associated with a volume from a filer until the filer is informed that no other filer needs that snapshot to mirror the volume from the filer. Preferably, each filer uses softlocks to track what snapshots correspond to volumes mirrored down the chain or cascade of filers.
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