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Chapter 2. Installing the
Battery Backup Unit
The Battery Backup Unit (BBU) is an add-on that can be attached
to a 3ware 9550SX RAID controller to supply power to the memory
module from an attached battery pack in the event of a system
power loss. This allows the controller to use write-caching for
optimal performance and not be exposed to data 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
flushed to disks.
Caution: Both the 3ware RAID controller and the BBU
are sensitive electronic equipment and can be damaged
through electrostatic discharge. When installing the
BBU on the controller, be sure you are grounded. Use a
grounding strap, or work on an ESD-protective mat.
Do not remove the 3ware controller or BBU from their
protective bags until you are properly grounded.
Handle the 3ware RAID controller by its edges or by
the metal bracket at its end.
Do not touch any pin, contact, lead, or component on
the 3ware RAID controller.
Important: The battery is a heat-sensitive component.
The cooler the battery, the longer the battery lasts. If
possible, place the controller with the BBU in a slot with
good airflow, away from components that generate the
most heat in the system, such as video cards.
Note: The battery will drain if it is plugged into the BBU
and there is no power to the unit. Wait to plug the
battery into the BBU until the system is ready for use.