Method, system, and program for improved throughput in remote mirroring systems
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United States of America Patent
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Feb 7, 2006
Grant Date -
Sep 16, 2004
app pub date -
Mar 11, 2003
filing date -
Mar 11, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
Disclosed is a method, system, and program for reducing an mount of data transferred. Indicators of sub-blocks modified for a block of data since the block of data was last sent to remote storage are maintained until the block of data is demoted. The maintained indicators are used to identify sub-blocks on the block of data for transfer to the remote storage. Disclosed is a method, system, and program for managing metadata in cache. A first policy is used to determine when to remove data from a primary cache, and a second policy is used to determine when to remove data from a metadata cache.
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