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Data redundancy system and method

DC
  • US 7,152,182 B2
  • Filed: 06/06/2003
  • Issued: 12/19/2006
  • Est. Priority Date: 06/06/2003
  • Status: Active Grant
First Claim
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1. A data redundancy system, comprising:

  • a primary storage facility for storing a primary copy of data, the primary storage facility including;

    a first redundancy appliance operable in a role for receiving a sequence of write requests and for storing data for the sequence of write requests in storage associated with the primary storage facility; and

    a second redundancy appliance for shadowing the first redundancy appliance wherein the second redundancy appliance assumes the role of the first redundancy appliance;

    a secondary storage facility for storing data that is redundant of the primary copy of the data, the secondary storage facility discrete from the primary storage facility and including;

    a third redundancy appliance operable in a role for storing redundant data for the sequence of write requests in storage associated with the secondary facility; and

    a fourth redundancy appliance for shadowing the third redundancy appliance wherein the fourth redundancy appliance assumes the role of the third redundancy appliance in the event of a fault at the third redundancy appliance.

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