RX900 S2 Upgrade and Maintenance Manual 169
Expansion cards and BBU
8.11 Installing a Battery Backup Unit (BBU)
V CAUTION!
● Do not connect the cable using excessive force, the connector is 
weak. 
● Follow the safety instructions in the chapter "Safety instructions" on 
page 31.
The Battery Backup Unit (BBU) backs up the memory contents of the SAS RAID 
controller in the event of a power failure. A maximum of two BBUs can be 
installed for each system.
I The RX900 S2 server can be equipped with one Modular RAID controller 
and two SAS RAID controllers but only for two of these RAID controllers 
a BBU can be installed.
8.11.1 Required tools
● Starting and completing the task:
– key for the rack doors (if applicable)
– Phillips Ph2 screw driver
● Installing the BBU: tool-less
Authorized personnel
Authorized specialist personnel can carry out replacement tasks for 
integral server components. Ask you local Fujitsu service center for 
more detailed information.
V CAUTION!
Procedures indicated as "Authorized personnel only“ must be 
done by Fujitsu service personnel or technicians trained by 
Fujitsu for doing these tasks. Please note that unauthorized 
interference with the system will void the warranty and exempt 
the manufacturer from all liability.