Fujitsu PRIMERGY RX2540 M6 Operating Manual page 86

Operation
– Power button override
The system can be switched off (hard power off) by keeping the On/Off
button (approximately 4 - 5 seconds).
CAUTION
There is a risk that data may be lost.
– iRMC
iRMC offers various options for switching the server on and off, e.g. via the
System power button on the Global icons of the iRMC web interface.
CAUTION
When switching off the power
The operation of the power switch can be specified as "Do Nothing",
"Stand by", "Hibernate", and "Shutdown" depending on the OS settings.
The default is "Shutdown".
On this server, functions corresponding to "Stand by" and "Hibernate"
are supported as BIOS and hardware functions. However, some drivers
and software installed in the server do not support these functions. For
this reason, functions corresponding to "Stand by" and "Hibernate" are
unavailable on this server. When the operating mode is set to "Stand by"
or "Hibernate", the system may operate improperly or HDD/SSD data
may be corrupted.
For more information about operating mode settings, see the manual
supplied with the OS.
86 Operating Manual RX2540 M6