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Method, system and article of manufacture for recovery from a failure in a cascading PPRC system

  • US 20050081091A1
  • Filed: 09/29/2003
  • Published: 04/14/2005
  • Est. Priority Date: 09/29/2003
  • Status: Active Grant
First Claim
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1. A method of recovery from a data storage system failure in a data storage system having a host computer writing data to a first storage unit associated with a first storage controller synchronously mirroring the data to a second storage unit associated with a second storage controller asynchronously mirroring the data to a third storage unit, the method comprising:

  • detecting a failure associated with the first storage unit;

    writing data updates directly to the second storage unit;

    correcting the failure associated with the first storage unit; and

    synchronously mirroring the data updates from the second storage unit to the first storage unit.

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