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Concurrent image backup for disk storage system

  • US 5,487,160 A
  • Filed: 12/04/1992
  • Issued: 01/23/1996
  • Est. Priority Date: 12/04/1992
  • Status: Expired due to Term
First Claim
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1. In a disk storage system, a method for concurrently backing up contents of said disk storage system to a backup storage device and processing a write I/O request received by said disk storage system, comprising the steps of:

  • sequentially copying data from said disk storage system to said backup storage device;

    halting said process of sequentially copying data from said disk storage system to said backup storage device upon receipt of said write I/O request;

    determining whether said write I/O request updates data residing in a storage area within said disk storage system which has not been copied to said backup device;

    copying the data residing in said storage area to a temporary storage device if the data residing in said storage area has not been copied to said backup device;

    executing said write I/O request to update the data residing in said storage area;

    resuming said process of sequentially copying data from said disk storage system to said backup storage device; and

    copying the contents of said temporary storage device to said backup storage device upon completion of said process of sequentially copying data from said disk storage system to said backup storage device.

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