Hewlett-Packard Battery Backup Unit (BBU)
Installation Guide (20-slot Disk Arrays)
Hewlett-Packard BBUs are customer installable and replaceable. A replacement BBU must be the same type as the BBU
The locations of the BBUs in the 20-slot disk arrays are shown in Figure 1.
Install or replace a BBU by performing the following steps. Place a check in the appropriate
Observe antistatic precautions
A BBU is shipped with an ESD kit containing:
ESD wrist strap
ESD conductive sheet
Ground the ESD wrist strap to any unplated metal on
the disk array chassis and fasten the strap to your wrist.
Prepare to install the BBU
Remove the new BBU from its shipping carton and
place it on a suitable antistatic surface or the ESD
Open the fan pack by sliding the LOCK/UNLOCK switch
to the UNLOCK position and carefully swinging the fan
The BBU can be installed or replaced with array power on.
The installation or replacement
fan pack closed within two minutes to avoid a thermal shut-
20-slot deskside and rackmount disk arrays (rear view)
(shown with fan packs removed for clarity)
be completed and the
Step 3: Install the BBU
Locate the slot where the BBU is to be installed (Figure
1) and remove the failed BBU or the BBU filler panel if
present (Figure 2). To remove the BBU, slide the black
latches toward the center of the unit and extract the
Install the BBU as shown in Figure 2.
Push the BBU into the disk array chassis until the
latches on the BBU lock and audible clicks are heard.
When the latches are locked, the BBU cannot be pulled
out again without using the latches.
as the step is completed.