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Method, system, and program for improved throughput in remote mirroring systems

  • US 7,581,063 B2
  • Filed: 06/03/2005
  • Issued: 08/25/2009
  • Est. Priority Date: 03/11/2003
  • Status: Active Grant
First Claim
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1. A method for managing metadata in cache, comprising:

  • for each of some blocks of data, in a metadata cache, maintaining a metadata cache modified sub-blocks structure with indicators indicating which sub-blocks of a block of data have been modified since the block of data was last transferred to remote storage, wherein the metadata cache is not large enough to hold the metadata cache modified sub-blocks structure for every block of data;

    using a first policy to determine when to remove data from a primary cache; and

    using a second policy to determine when to remove each metadata cache modified sub-blocks structure from the metadata cache.

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