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CHECKPOINTS FOR A FILE SYSTEM

  • US 20110307449A1
  • Filed: 06/15/2010
  • Published: 12/15/2011
  • Est. Priority Date: 06/15/2010
  • Status: Active Grant
First Claim
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1. A method implemented at least in part by a computer, the method comprising:

  • indicating that a first set of updates are to be associated with a first checkpoint;

    determining to write checkpoint data regarding the first checkpoint to a storage of a file system that uses copy on write to update data of the file system;

    indicating that any updates that occur subsequent to the first set of updates are to be associated with a subsequent checkpoint;

    generating write plans for the first set of updates, each write plan indicating at least a planned location on storage for data representing at least one of the first set of updates;

    updating metadata to indicate allocation data of the file system as well as storage locations for file system objects modified by the write plans; and

    creating a logical copy of the metadata.

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