Battery backup unit

Battery backup units provide backup for SAS RAID controller modules cache.

Battery backup units are installed in the battery backup unit bays located in the media tray when you install SAS RAID controller modules. The battery backup unit in battery backup bay 1 provides backup support for the SAS RAID controller module in I/O module bay 3; the battery backup unit in battery backup bay 2 provides backup support for the SAS RAID controller module in I/O module bay 4.

Note: Both battery backup units are required if you install SAS RAID controller modules.

Graphic showing close up front view of battery backup unit with LEDs identified

Controls and indicators

The battery backup unit provides the following indicators:

Power: Lit (green). Power is being supplied to the battery backup unit.
Charging: Lit (green). The battery backup unit is being charged.
Fault: Lit (amber). The battery backup unit has a failure. If the Fault LED is lit, replace the battery backup unit.