Broadcom CacheVault Power Module

RAID controller cards temporarily cache data from the host system until
it is successfully written to the storage media. While cached, data can
be lost if system power fails, jeopardizing the data’s permanent
integrity.

RAID caching is a cost-effective way to improve I/O
performance by writing data to a controller’s cache before it is written
to disk. However, in the event of a power or server failure, the writes
in cache may be lost.

CacheVault® flash cache protection modules
and battery backup units (BBUs) protect the integrity of cached data by
storing cached data in non-volatile flash cache storage or by providing
battery power to the controller.

CacheVault technology prevents
data loss by powering critical components of the card long enough to
automatically transfer the cached data to NAND flash. Once power
returns, the data is restored to the cache and normal operation resumes.
By using a super-capacitor instead of Lithium-ION batteries, CacheVault
technology virtually eliminates hardware maintenance costs associated
with batteries, lowers total cost of ownership over the life of the
controller card and provide more environmentally friendly cache
protection, all while maintaining optimal RAID performance.