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Recovery method for a high availability data processing system

  • US 5,615,330 A
  • Filed: 10/16/1995
  • Issued: 03/25/1997
  • Est. Priority Date: 11/12/1994
  • Status: Expired due to Term
First Claim
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1. A recovery method for a data processing system comprising a first data processing unit, a second data processing unit, a first boot disk, a second boot disk, and a plurality of shared disks, said system having a normal configuration in which said first boot disk is accessible only from said first processing unit, said second boot disk is accessible only from said second processing unit, and said shared disks are accessible from both said first data processing unit and said second data processing unit,the recovery method comprising the steps:

  • (a) upon failure of said second boot disk, removing said second boot disk from the system;

    (b) temporarily reconfiguring the system into a recovery configuration in which a new boot disk is connected in place of one of said shared disks;

    (c) while the system is in said recovery configuration, operating said first processing unit to copy information from said first boot disk to said new boot disk; and

    (d) restoring the normal configuration of said system, with said new boot disk in place of said second boot disk.

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