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Avoiding A Ping-Pong Effect On Active-Passive Storage

  • US 20130151888A1
  • Filed: 12/12/2011
  • Published: 06/13/2013
  • Est. Priority Date: 12/12/2011
  • Status: Abandoned Application
First Claim
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1. A method for avoiding a ping-pong effect on active-passive paths in a storage system managing one or more logical storage units (LUNs), comprising:

  • designating a first path to said LUNs as an active path for use by host systems to access said LUNs for data storage input/output (I/O) operations;

    designating a second path to said LUNs as a passive path for use by said host systems to access said LUNs for said data storage I/O operations;

    designating said first path as a preferred path for use by said host systems to access said LUNs for said data storage I/O operations;

    in response a failover host system initiating a failover operation due to a path failure on said first path, performing said failover operation by designating said second path as the active path to said LUNs and designating said first path as the passive path to said LUNs, said failover operation being performed without changing said designation of said first path as the preferred path to said LUNs;

    conditionally inhibiting a subsequent failback operation that attempts to redesignate said first path as the active path to said LUNs due to said first path being the preferred path to said LUNs; and

    said inhibiting being conditioned on said failback operation being initiated by a host system that is not said failover host, such that only said failover host is permitted to initiate said failback operation.

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