EUROLOGIC SANbloc MAN-FC2000-RAID, Installation Manual

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Hardware Information
19
Battery Backup Unit
Board
A Battery Backup Unit (BBU) maintains memory content
in the event of an AC power failure. The main purpose of the
BBU is to provide AC power glitch ride-through, however,
the BBU is capable of sustaining memory content for an
extended period.
The BBU is designed to work with SDRAM memory, and
supports both the processor control store and ASIC cache
memory SDRAM. The BBU logic detects power loss on the
controller and switches the SDRAM to a self-refresh mode
while transparently switching the power input from +5V to
battery. The BBU can sustain memory content for at least 72
hours
1
under typical operating conditions.
1. This figure can be greater depending on the cache size.