Distributed free block map for a clustered redirect-on-write file system
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United States of America Patent
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Jun 4, 2013
Grant Date -
Jun 14, 2012
app pub date -
Dec 8, 2010
filing date -
Dec 8, 2010
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Abstract
In a cluster that distributes fileset management, fileset managers will maintain a free block map and an in-flight block map to allocate blocks to clients writing to a relevant fileset. A fileset manager managing free block allocation for cluster clients that write to a fileset managed by the fileset manager. Since a clustered file system manager manages an initial free block map for the cluster (“cluster free block map”), the clustered file system manager provisions free blocks to fileset managers from the cluster free block map. The fileset manager then allocates free blocks from the provisioned free blocks to cluster clients that write to the fileset managed by the fileset manager.
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