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Super-capacitor pack – HP StorageWorks 2000fc G2 Modular Smart Array User Manual

Page 20

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20

Components

CAUTION:

To preserve the existing data stored in the CompactFlash, you must transport the

CompactFlash from the failed controller to the replacement controller using a procedure outlined in the HP

StorageWorks 2312fc/2324fc controller replacement instructions, shipped with the replacement controller.

Failure to use this procedure will result in the loss of data stored in the cache module. The CompactFlash

must stay with the same enclosure. If the CompactFlash is used/installed in a different enclosure, data

loss/data corruption will occur.

IMPORTANT:

In dual controller configurations, there is no need to transport a failed controller’s cache to

a replacement controller because the cache is duplicated between the controllers.

Super-capacitor pack

To protect RAID controller cache in case of power failure, the MSA2312fc and MSA2324fc are equipped

with super-capacitor technology. The super-capacitor pack and CompactFlash memory in each controller

module provide unlimited cache memory backup time. The super-capacitor pack provides energy for

backing up unwritten data in the write cache to the CompactFlash in the event of a power failure. Unwritten

data in CompactFlash memory is automatically committed to disk media when power is restored. While

the cache is being maintained by the super-capacitor, the Cache Status LED flashes at a rate of 1/10

second on and 9/10 second off.