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Chapter 3. Installing a Battery
Backup Unit
The Battery Backup Unit (BBU) is an optional add-on consisting of
a control module and a battery pack.
When used with the 3ware 9690SA RAID controller, the BBU
control module is mounted on the RAID controller and the battery
pack is installed on a remote battery board.
The BBU’s purpose is to supply power to the controller’s memory
module in the event of a system power loss. This allows the
controller to safely use write-caching for optimal performance
without exposing data to potential loss in the event of a system
power failure. When fully charged, the battery preserves the
contents of the controller cache memory for a limited period of time
(up to 72 hours). When power is restored, cached data is written to
disks.
Items in Remote Battery Installation Package
Battery Backup Unit (BBU) control module
Battery
Battery extension cable
Remote battery board with full height bracket
Low-profile bracket for low-profile enclosures.
Remote Battery Installation Guide (This chapter covers same
material)