System for Maintaining Dirty Cache Coherency Across Reboot of a Node
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United States of America Patent
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Issued Date -
Jan 15, 2015
app pub date -
Aug 15, 2013
filing date -
Jul 11, 2013
priority date (Note) -
Abandoned
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Abstract
Nodes in a data storage system having redundant write caches identify when one node fails. A remaining active node stops caching new write operations, and begins flushing cached dirty data. Metadata pertaining to each piece of data flushed from the cache is recorded. Metadata pertaining to new write operations are also recorded a corresponding data flushed immediately when the new write operation involves data in the dirty data cache. When the failed node is restored, the restored node removes all data identified by the metadata from a write cache. Removing such data synchronizes the write cache with all remaining nodes without costly copying operations.
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