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Space reclamation with virtually provisioned devices

  • US 8,959,305 B1
  • Filed: 06/29/2012
  • Issued: 02/17/2015
  • Est. Priority Date: 06/29/2012
  • Status: Active Grant
First Claim
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1. A method for performing reclaim processing of a storage system with virtually provisioned devices, comprising:

  • identifying at least one track corresponding to a virtually provisioned device of the storage system that is a candidate for reclaiming, wherein the at least one track is virtually provisioned to the virtually provisioned device but for which no requirement exists that the at least one track is backed by physical storage of the storage system;

    marking the at least one track, as a marked track, wherein the marked track is marked using at least one bit that is independent of any current data content corresponding to the marked track, and wherein setting of the at least one bit does not reflect whether the marked track is backed by physical storage;

    detecting the marked track; and

    reclaiming the marked track to a free track pool of the storage system.

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