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Remote data mirroring

DC
  • US 5,742,792 A
  • Filed: 05/28/1996
  • Issued: 04/21/1998
  • Est. Priority Date: 04/23/1993
  • Status: Expired due to Term
First Claim
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1. A system for automatically providing remote copy data storage, said system comprising:

  • a host computer;

    a first data storage system including at least a first data storage system controller and at least one data storage device, said first data storage system being coupled to said host computer for storing data to be accessed by at least said host computer;

    a second data storage system including at least a second data storage system controller and at least one data storage device, said second data storage system being remotely coupled to said first data storage system for copying of said data to said second data storage system controller; and

    said first data storage system controller coordinating and controlling the copying of said data to said second data storage system controller wherein said first data storage system maintains an index, said index including at least a first indicator providing an indication of whether a predetermined data element stored on said first data storage system is valid, a second indicator providing an indication of whether said predetermined data element stored on said second data storage system is valid, a third indicator providing an indication of whether a write is pending to said predetermined data element stored on said first data storage system, and at least a fourth indicator providing an indication of whether a write is pending to said predetermined data element stored in said second data storage system.

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