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Method and system for mirroring and archiving mass storage

  • US 6,609,183 B2
  • Filed: 05/28/2002
  • Issued: 08/19/2003
  • Est. Priority Date: 02/23/1999
  • Status: Expired due to Term
First Claim
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1. In a primary system that has a primary mass storage and is in communication with a secondary system that has a secondary mass storage, a method for mirroring and archiving the primary mass storage on the secondary mass storage, the method comprising:

  • synchronizing the secondary mass storage with the primary mass storage;

    tracking changes to the primary mass storage during a time interval;

    identifying an end of the time interval by identifying when the primary mass storage is in a logically consistent state;

    consolidating the tracked changes by retaining any tracked changes necessary to represent the state of the primary mass storage at the end of the time interval, so as to create an update that includes the retained changes but does not include tracked changes that represent an intermediate state of the primary mass storage; and

    transferring the update to the secondary mass storage, the update including only the changes that are required for bringing the secondary mass storage device current with the logically consistent state of the primary mass storage device.

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