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Continuous data backup using distributed journaling

  • US 7,318,134 B1
  • Filed: 03/16/2004
  • Issued: 01/08/2008
  • Est. Priority Date: 03/16/2004
  • Status: Active Grant
First Claim
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1. A method for providing a backup copy of data on a primary storage comprising:

  • receiving a write request from one of a plurality of sources;

    journaling said write request in one of a plurality of partial journals, wherein each of said plurality of partial journals is used to journal a portion of write requests received from a different one of said plurality of sources, wherein each of said plurality of partial journals is emptied to a primary journal including partial journal entries and merged partial journal entries, each of the merged partial journal entries representing application of one or more data modifications for a time period to a storage location; and

    updating said primary storage in accordance with said write request.

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