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Data storage system with persistent volatile memory across power failures

  • US 7,761,681 B2
  • Filed: 10/05/2007
  • Issued: 07/20/2010
  • Est. Priority Date: 08/28/2003
  • Status: Expired due to Fees
First Claim
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1. An apparatus for use in a data storage subsystem comprising:

  • a volatile memory;

    a nonvolatile memory;

    a temporary power supply;

    processing logic that;

    detects an interruption in the power supply to the volatile memory;

    in the event of such detection, performs the steps of;

    determines an amount of stored power of the temporary power supply, wherein the amount of stored power is a relative amount of power greater than zero up to a larger amount of power;

    calculates an amount of data stored in the volatile memory that can be written to the nonvolatile memory before the amount of stored power of temporary power supply is depleted; and

    writes the calculated amount of data stored in the volatile memory to the nonvolatile memory using the amount of stored power supplied by the temporary power supply.

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