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Cisco Bug: CSCub12581 - Storage subsystem must generate events on battery state changes.

Last Modified

Dec 02, 2013

Products (1)

  • Cisco Unified Computing System

Known Affected Releases


Description (partial)

RAID subsystem Virtual Drive write performance can drop without warning from the CiMC.

If an installed RAID card has a battery backed write-back RAM cache, the battery will occasionally need to go through a relearn (refresh) cycle.  While the battery is discharging and recharging, it is not safe to only write data to RAM, so the cache goes into write-through mode, which slows (sometimes severely) Virtual Drive performance.
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