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Managing checkpoint queues in a multiple node system

  • US 7,296,039 B2
  • Filed: 10/12/2004
  • Issued: 11/13/2007
  • Est. Priority Date: 11/24/1998
  • Status: Expired due to Term
First Claim
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1. A method for writing data items to persistent storage, the method comprising the steps of:

  • maintaining, within a first node, a first queue of entries that correspond to dirty data items that need to be written to persistent storage;

    maintaining, within the first node, a second queue of entries that correspond to dirty data items that need to be written to persistent storage;

    in response to determining that a dirty data item, corresponding to a particular entry, needs to be transferred to a node other than said first node, moving said particular entry from said first queue to said second queue;

    selecting, at the first node, which data items to write to persistent storage based on which queue, of the first queue and the second queue, an entry for a data item resides in, wherein said selecting gives priority to data items that correspond to entries in said second queue; and

    writing, to persistent storage, a particular data item selected based on which queue, of the first queue and the second queue, an entry for the particular data item resides in.

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