1.1 Turning the System On and Off
1.1.1 Powerup Sequence
Caution
To avoid unpredictable system operation, always turn the system
components on or off in the correct sequence.
Take these steps to power up the DECmpp 12000/Sx:
1.
Set the DPU rear circuit breaker to ON.
2.
Turn on the DPU, setting the keyswitch to ON.
3.
Turn on the Parallel Disk Array (PDA), if present in the configuration, by
setting the rear circuit breaker to ON.
4.
Turn on the server.
5.
Boot the server.
When the system boots, it is ready to operate.
If you boot the server before you turn on the DPU, you cannot access the DPU.
Any time you reconnect or cycle DPU power down and up, you must reboot the
server.
1.1.2 Powerdown Sequence
Take these steps to power down the DECmpp 12000/Sx:
1.
Halt the server, using either the
/etc/halt
or
/etc/shutdown
command.
2.
Turn off the PDA, if present in the configuration, by setting the rear circuit
breaker to OFF.
3.
Turn off the DPU, setting the keyswitch to OFF.
4.
Set the DPU rear circuit breaker to OFF.
5.
Turn off the server.
Warning
Always set the circuit breaker at the rear of the DPU to OFF and unplug
the power cord when working on the power supply or power system.
1–6 System Overview
