Destaging cache data using a distributed freezer
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United States of America Patent
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Aug 16, 2016
Grant Date -
Sep 24, 2015
app pub date -
Jun 5, 2015
filing date -
Apr 16, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
Methods, apparatus and computer program products implement embodiments of the present invention that enable digital information devices having respective storage devices and memories to distributedly store, for a logical volume, data and first and second parity values across corresponding regions of the storage devices. Freezers having a one-to-one correspondence with the storage devices are distributedly stored in the memories. Upon detecting, in a cache, updated data for one or more first regions on the storage devices, existing data from the one or more first regions, and additional data for parity calculations are retrieved from one or more corresponding second regions on the storage devices, and first and the second parity values are calculated using the updated data, the existing data and the additional data, and the updated data and the calculated first and second parity values are stored to the freezers.
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