Warmswap of failed memory modules and data reconstruction in a mirrored writeback cache system
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United States of America Patent
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May 27, 2003
Grant Date -
N/A
app pub date -
Jun 26, 1997
filing date -
Jun 26, 1997
priority date (Note) -
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Abstract
A warmswap operation to replace modules in a mirrored cache system has been accomplished by disabling mirrored write operations in the cache system; testing the replacement memory module in the cache system; and restoring the mirrored data in the cache system. The restoring operation is accomplished by first quiescing write operations to stop writing data in the cache system not backed up in non-volatile data storage. Then data is copied from surviving memory modules to the replacement module, and the cooperative interaction of the surviving memory modules with the replacement memory module is validated. The validating operation verifies the cache modules are ready and the controllers are synchronized. After validation the quiesced write operations are un-quiesced, and mirrored-write operations for the cache system are enabled.
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