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Method and apparatus for securing volatile data in power failure in systems having redundancy

  • US 6,990,603 B2
  • Filed: 01/02/2002
  • Issued: 01/24/2006
  • Est. Priority Date: 01/02/2002
  • Status: Active Grant
First Claim
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1. A computer system comprising:

  • a main sub-system comprising a main control unit, a main volatile memory, and a main updateable non-volatile memory;

    a mirror sub-system comprising a redundant control unit, a redundant volatile memory, and a redundant updateable non-volatile memory;

    a communication link coupled between said main sub-system and said mirror sub-system;

    an uninterruptible power supply connected to said main sub-system and said mirror sub-system; and

    means for tracking data not previously copied to said non-volatile memory or to said mirror sub-system, wherein, upon the detection of a power supply failure to said main sub-system, only data in said main volatile memory not previously copied to said non-volatile memory or to said mirror sub-system is copied to said main updateable non-volatile memory.

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