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Data recovery for virtual ordered writes for multiple storage devices

  • US 7,228,456 B2
  • Filed: 12/01/2003
  • Issued: 06/05/2007
  • Est. Priority Date: 12/01/2003
  • Status: Active Grant
First Claim
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1. A method of recovering data provided by a plurality of primary storage devices to a plurality of secondary storage devices, comprising:

  • the secondary storage devices receiving data in chunks, each chunk having a sequence number associated therewith, wherein writes by the primary storage devices begun before a particular time are assigned a first sequence number and writes begun by the primary storage devices begun after the particular time are assigned a second sequence number different than the first sequence number and wherein switching of sequence numbers is coordinated between the primary storage devices;

    for each of the secondary storage devices, discarding data corresponding to chunks for which all data thereof has not been received; and

    for each of the secondary storage devices, restoring a chunk of data thereto wherein all of the chunks of data restored to the plurality of secondary storage devices have the same sequence number.

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