AssuredSAN 4004 Series Setup Guide 27
CAUTION: The CompactFlash memory card should only be removed for transportable purposes. 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 AssuredSAN 4004 Series FRU
Installation and Replacement Guide within the procedure for replacing a controller module. 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 partner controller, there is no need to
transport failed controller cache to a replacement controller because the cache is duplicated between the
controllers (subject to volume write optimization setting).
Supercapacitor pack
To protect controller module cache in case of power failure, each controller enclosure model is equipped
with supercapacitor technology, in conjunction with CompactFlash memory, built into each controller
module to provide extended cache memory backup time. The supercapacitor 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.
In the event of power failure, while cache is maintained by the supercapacitor pack, the Cache Status LED
flashes at a rate of 1/10 second on and 9/10 second off.
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