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System and method for efficient failover/failback techniques for fault-tolerant data storage system

  • US 20020133735A1
  • Filed: 01/16/2001
  • Published: 09/19/2002
  • Est. Priority Date: 01/16/2001
  • Status: Active Grant
First Claim
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1. A method for efficient failover/failback in a data storage system, the data storage system managed in a dual-active controller configuration, the method comprising:

  • defining a stripe lock data structure to maintain reservation status or stripe locks of cache lines within data extents that are part of a logical unit or storage volume;

    when a controller fails, taking over dirty cache line data of a failed controller by a survivor controller; and

    using the stripe lock data structure to process I/O requests from a host system, by the failed controller, until the dirty cache line data is flushed to one or more storage volumes, by the survivor controller.

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