Multi-way checkpoints in a data storage system
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United States of America Patent
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Sep 19, 2017
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N/A
app pub date -
Jun 30, 2008
filing date -
Jan 16, 2008
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Abstract
Embodiments of the present invention allow multiple checkpoints to be taken so that multiple versions of the filesystem, including a working version and at least two checkpoint versions, can be maintained over time. Specifically, at least three “superblock” root structures are used to manage multiple instantiations of the filesystem. The superblocks are preferably stored in fixed locations within the storage system for easy access, although they may alternatively be stored in other ways. The number of superblocks may be fixed or variable.
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