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Method and system for rapidly recovering data from a “dead” disk in a RAID disk group

  • US 7,587,630 B1
  • Filed: 04/29/2005
  • Issued: 09/08/2009
  • Est. Priority Date: 04/29/2005
  • Status: Active Grant
First Claim
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1. A method comprising:

  • responsive to identifying a particular mass storage device in a redundancy group of mass storage devices as incapable of servicing client-initiated requests in a timely manner;

    automatically allocating a spare mass storage device to replace the particular mass storage device in the redundancy group of mass storage devices;

    generating a disk cookie for the spare mass storage device, the disk cookie used to generate a data validity tag for indicating the validity of data written to the spare mass storage device;

    forwarding client-initiated write requests directed to the particular mass storage device to the spare mass storage device for servicing; and

    initiating a device-to-device copy operation to systematically read data from the particular mass storage device and write the data to the spare mass storage device without overwriting data on the spare mass storage device with stale data from the particular mass storage device.

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