Remote data mirroring
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United States of America Patent
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May 30, 2006
Grant Date -
Apr 15, 2004
app pub date -
Dec 27, 2002
filing date -
Apr 23, 1993
priority date (Note) -
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status (Latency Note)
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Abstract
Two data storage systems are interconnected by a data link for remote mirroring of data. Each volume of data is configured as local, primary in a remotely mirrored volume pair, or secondary in a remotely mirrored volume pair. Normally, a host computer directly accesses either a local or a primary volume, and data written to a primary volume is automatically sent over the link to a corresponding secondary volume. Each remotely mirrored volume pair can operate in a selected synchronization mode including synchronous, semi-synchronous, adaptive copy--remote write pending, and adaptive copy--disk. Direct write access to a secondary volume is denied if a 'sync required' attribute is set for the volume and the volume is not synchronized.
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