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Coordinating write sequences in a data storage system

  • US 8,935,354 B2
  • Filed: 07/27/2012
  • Issued: 01/13/2015
  • Est. Priority Date: 12/02/2011
  • Status: Expired due to Fees
First Claim
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1. A method for coordinated sequencing of writes, comprising:

  • responsive to a primary device receiving a request to write to primary storage, receiving from the primary device a request for a sequence number;

    generating a current sequence number for the write;

    generating a first identifier indicating an identity of secondary devices writing to secondary storage based on the current sequence number;

    generating a second identifier indicating an identity of secondary devices writing to secondary storage based on the current sequence number and a previous sequence number;

    transmitting the current sequence number and the second identifier to the primary device; and

    transmitting the current sequence number and the first identifier to the secondary devices writing to secondary storage based on the previous sequence number.

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