HP 2000I G2-Modular-Smart-Array - Manual (Page 20)

20 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 2312i/2324i 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 2312i G2 and 2324i 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.