HP 2000sa HP StorageWorks 2312sa and 2324sa Modular Smart Array user guide (48 - Page 20

Super-capacitor pack, CAUTION, IMPORTANT

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CAUTION: To preserve the existing data stored in the CompactFlash, you must transport the CompactfFlash from the failed controller to the replacement controller using a procedure outlined in the HP StorageWorks 2312sa/2324sa G2 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 2312sa G2 and 2324sa G2 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 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. 20 Components

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Components
CAUTION:
To preserve the existing data stored in the CompactFlash, you must transport the
CompactfFlash from the failed controller to the replacement controller using a procedure outlined in the
HP
StorageWorks 2312sa/2324sa G2 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 2312sa G2 and 2324sa G2 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 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.