Fujitsu Primergy RX900 S2 Operating Manual page 17

Battery Backup Units
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.
Accessible drives
One optical drive is installed in the RX900 S2 server. It cannot be replaced
during operation.
ServerView Local Service Display (LSD) / ServerView Local Service Panel
(LSP)
A ServerView Local Service Display is installed in the RX900 S2 server. It
cannot be replaced during operation.
Power supply
The server has up to four hot-plug power supply units and supports a mains
voltage of 200 VAC - 240 VAC. The minimum system configuration with 4
CPUMEMRs requires the installation of two power supply units in a 1+1
redundant configuration. With more than 4 CPUMEMRs a minimum of 3 power
supply unit is needed in a 2+1 redundant configuration. If one power supply unit
is defective, the others guarantee unimpaired operation. The faulty power
supply unit can be replaced during operation, see "PRIMERGY RX900 S2
Server Upgrade and Maintenance Manual".
Cooling
The RX900 S2 server comprises two air circuits that are independent of each
other:
Four fan modules in a 3+1 redundant configuration circulate the air in the
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area of the CPUMEMRs and the PCIe slots. Heat sinks mounted on the
processors help to conduct the heat emission of the processors.
The fans included in the 2+1 or 2+2 redundant power supply units circulate
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the air for the power supply units themselve and for the HDD/SSD module.
RX900 S2
Operating Manual
Functional overview
17