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Storage systems using write off-loading

  • US 8,074,014 B2
  • Filed: 03/31/2008
  • Issued: 12/06/2011
  • Est. Priority Date: 03/31/2008
  • Status: Active Grant
First Claim
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1. A method of storing data comprising:

  • receiving a request from a client to store data on a first storage device;

    determining if defined criteria are met;

    storing a most recent version of the data, if the defined criteria are met, on a second storage device and not on the first storage device by sending a write request to the second storage device, the second storage device comprising a circular log;

    maintaining an identity of the second storage device amongst a set of identified storage devices in a hard state data structure;

    maintaining logical block numbers for circular log blocks storing the data and a version number of the most recent version of the data in a soft state redirect data structure; and

    maintaining locations of older versions of the data in the circular log in a soft state garbage data structure until the older versions are invalidated.

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