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Universal multi-path driver for storage systems including an external boot device with failover and failback capabilities

  • US 7,406,617 B1
  • Filed: 11/22/2004
  • Issued: 07/29/2008
  • Est. Priority Date: 11/22/2004
  • Status: Active Grant
First Claim
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1. A method comprising:

  • monitoring via a universal multipath driver (UMD) a first path to one of a plurality of virtual device objects, the virtual device objects being created by the UMD and corresponding to a plurality of functional device objects, the functional device objects being created by a plurality of lower level drivers and corresponding to a plurality of real physical devices having M device types including an external boot device, the UMD being a functional driver of each of the functional device objects, the lower level drivers controlling the real physical devices;

    detecting via the UMD a failure of the first path to a first virtual device object corresponding to a first real physical device; and

    performing via the UMD one of failover and failback for the first real physical device.

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