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METHOD AND SYSTEM FOR POWER AWARE I/O SCHEDULING

  • US 20090265519A1
  • Filed: 04/18/2008
  • Published: 10/22/2009
  • Est. Priority Date: 04/18/2008
  • Status: Active Grant
First Claim
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1. A method for retrieving a logical block, comprising:

  • receiving a request to read the logical block;

    obtaining metadata associated with the logical block, wherein the metadata comprises;

    a replication type used to store the logical block, andphysical block locations in a storage pool for each physical block associated with the logical block, wherein each physical block location specifies one of a plurality storage devices in the storage pool;

    obtaining power state information comprising a power state for each of the storage devices specified in the physical block locations;

    selecting a first set of physical block locations using the metadata, the power state information, and a power-usage selection policy;

    generating a first set of I/O requests, wherein each I/O request specifies one of the issuing the first set of I/O requests;

    receiving the first set of physical blocks in response to the first set of I/O requests; and

    constructing the logical block using the first set of physical blocks.

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