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Remote copy secondary data copy validation-audit function

  • US 5,592,618 A
  • Filed: 10/03/1994
  • Issued: 01/07/1997
  • Est. Priority Date: 10/03/1994
  • Status: Expired due to Term
First Claim
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1. A method for validating whether shadowed data is a true copy of primary data updates, wherein the primary data updates are generated by one or more applications running in a primary processor at a primary site, the primary data updates received by a primary storage subsystem, each primary data update identified by a unique device and subsystem address, the primary storage subsystem causing I/O write operations to write each primary data update therein, and wherein a secondary site, whether local to or remote from the primary site, shadows the primary data updates in sequence consistent order such that data at the secondary site is available for disaster recovery purposes, the method comprising steps of:

  • (a) operating the primary and secondary sites in a full duplex mode such that the primary data updates are continuously shadowed at the secondary site;

    (b) initiating a validation session in the primary and secondary sites, including identifying those primary data updates to be validated as properly shadowed at the secondary site;

    (c) determining device and subsystem addresses for the identified primary data updates;

    (d) specifying a copy start time for grouping a portion of the identified primary data updates to be validated, the copy start time being a logically equivalent time at the primary and secondary sites for the grouped portion of the identified primary data updates and the corresponding shadowed data at the secondary site;

    (e) creating first check codes at the primary site for the grouped portion of primary data updates, and creating second check codes at the secondary site for the corresponding shadowed data; and

    (f) comparing the first and second check codes for determining whether the shadowed data is a true copy of the corresponding primary data updates.

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