Fujitsu Primergy CX400 S2 Operating Manual page 12

Functional overview
Power supply
The system has two bays for hot-swap power supply units. If one power supply
unit is defective, a warning is generated and all CPUs will be forced to work with
the lowest frequency. Each hot-plug power supply unit can be replaced during
operation (see the "PRIMERGY CX400 S2 Upgrade and Maintenance
Manual").
The server enclosure uses a hot-plug PSU, which automatically sets itself to a
mains voltage in the range of 100 - 240 V.
High level of availability and data security
When memory data is accessed, 1-bit errors are identified in the main memory
and automatically corrected with the error correcting code (ECC) method.
ASR&R (Automatic Server Reconfiguration and Restart) restarts the system in
the event of an error and automatically "hides" the defective system
components.
A RAID controller supports different RAID levels and increase the availability
and data security of the system.
The hot-plug HDD modules provide additional availability.
12 Operating Manual
CX400 S2