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Failover system for a DASD storage controller reconfiguring a first processor, a bridge, a second host adaptor, and a second device adaptor upon a second processor failure

  • US 6,061,750 A
  • Filed: 02/20/1998
  • Issued: 05/09/2000
  • Est. Priority Date: 02/20/1998
  • Status: Expired due to Term
First Claim
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1. A method for a storage controller to interface between a plurality of host systems and direct access storage devices (DASDs), comprising the steps of:

  • (a) configuring a bridge, a first host adaptor, and a first device adaptor to communicate with a first processor, wherein a first DASD is linked to the first device adaptor, and wherein the bridge interfaces the first processor, the first host adaptor, and the first device adaptor;

    (b) configuring the bridge, a second host adaptor, and a second device adaptor to communicate with a second processor, wherein a second DASD is linked to the second device adaptor, and wherein the bridge interfaces the second processor, the second host adaptor, and the second device adaptor;

    (c) directing an input/output (I/O) request from at least one of the host systems to the first DASD via the first host adaptor, the first processor, and the first device adaptor;

    (d) directing an I/O request from at least one of the host systems to the second DASD via the second host adaptor, the second processor, and the second device adaptor;

    (e) determining whether the second processor has failed; and

    (f) configuring, with the first processor, the bridge, the second host adaptor, and second device adaptor to communicate with the first processor, wherein after configuration in response to determining that the second processor has failed, an I/O request from at least one of the host systems to the second DASD is transferred via the second host adaptor, the first processor, and the second device adaptor.

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