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Copying method between logical disks, disk-storage system and its storage medium

  • US 6,732,245 B2
  • Filed: 09/30/2002
  • Issued: 05/04/2004
  • Est. Priority Date: 09/30/1999
  • Status: Expired due to Term
First Claim
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1. An accessing method of logical disks comprising:

  • first accessing a cache memory to store part of data of the logical disks that is staged from the logical disks according to an access request from a host;

    second accessing a designated logical disk when not finding a target data in the cache memory by said first accessing and staging said target data from said designated logical disk to said cache memory in response to said access request from said host; and

    copying data from a copy-source logical disk to a copy-destination logical disk according to a copy instructions from the host;

    wherein the copying comprising;

    performing said staging to stage data of a copy target area of the copy-source logical disk to a first cache memory to store part of data of the copy-source logical disk;

    transferring the staged data in the first cache memory to a second cache memory to store part of data of the copy-destination logical disk;

    writing the transferred data in the second cache memory to the copy-destination logical disk, referencing control information that indicates a copying condition of the each of the areas of the copy-source logical disk in a first bitmap and determining a next copy area according to the reference result, updating the control information in the first bitmap and a second bitmap that indicates a copying condition of the each of the areas of the copy-destination disk, interrupting said copying in response to the access request from the host; and

    allowing accesses to the copy-source logical disk by referring the first bitmap when said access request is a request for the copy-source logical disk and to the copy-destination logical disk by referring the second bitmap when said request for the copy-destination logical disk during said copying.

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