Flash disk cache management for increased virtual LUN availability
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United States of America Patent
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Jan 30, 2018
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app pub date -
Mar 30, 2016
filing date -
Mar 30, 2016
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Abstract
Systems, methods, and computer readable media are disclosed. A map including the number of dirty cache pages stored in the flash disk cache for each VLUN of the plurality of VLUNs on the storage system is maintained, by the storage system. A flash disk cache error requiring the storage system to take the flash disk cache offline is detected. In response to detecting the flash disk cache error a first one or more VLUNs of the plurality of VLUNs with at least one dirty cache page stored in the flash disk cache are identified by the storage system based on the map. The first one or more VLUNs are taken offline by the storage system. The flash disk cache is taken offline by the storage system. A second one or more VLUNs comprising VLUNs of the plurality of VLUNs without dirty cache pages stored in the flash disk cache are maintained online by the storage system.
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