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HP P2000 G3 SAS MSA System User Guide 21

NOTE: See HP P2000G3MSA System SMU Reference Guide for more information about volume cache

options.

Transportable CompactFlash

During a power loss or array controller failure, data stored in cache are saved off to non-volatile memory

(CompactFlash). These data are then written to disk after the issue is corrected. To protect against writing

incomplete data to disk, the image stored on the CompactFlash is verified before committing to disk.

In single-controller configurations, if the controller has failed or does not start, and the Cache Status LED is

on or blinking, the CompactFlash will need to be transported to a replacement controller to recover data

not flushed to disk (See Controller failure in a single-controller configuration on page 51 for more

information).

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

Controller Module 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 featuring one healthy peer controller, 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, P2000 G3 MSA System controllers are equipped

with super-capacitor technology, in conjunction with CompactFlash memory, built into each controller

module to 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 are 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.

Controller Module

CompactFlash

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