Implementing enhanced data caching and takeover of non-owned storage devices in dual storage device controller configuration with data in write cache
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United States of America Patent
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Jan 19, 2016
Grant Date -
Feb 19, 2015
app pub date -
Aug 15, 2013
filing date -
Aug 15, 2013
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Abstract
A method, system and computer program product are provided for implementing enhanced data caching and takeover of non-owned storage devices in a computer system. Each of a first controller and a second controller has a cache memory. During normal run-time, each storage device controller validates cached write data after it is written to its cache memory by reading the write data from its cache memory. If any error is detected on the read, then unit check failed storage device controller, which results in a reset of the failed storage device controller. When a storage device controller detects its dual partner controller fails, the surviving storage device controller queues host read/write operations for its storage devices already owned, and tests a cache mirrored copy from its cache memory of the failed first storage device controller before takeover of the failed controller's storage devices.
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