NonStop S-Series Operations Guide (G06.24+)

Starting and Stopping the System
HP NonStop S-Series Operations Guide—522459-007
16-22
Powering Off the System
Powering Off the System
The system powers off by powering off all system components and finally shutting
down the power supplies. In this state, you can power up the system only by pressing
the power-on push button on either PMF CRU in group 01.
The method you use to power off a system depends on the state of the system:
•
Under normal circumstances, use SCF to power off a running system that has
been brought to an orderly stop. (All processors except one have been halted.)
See System Power-Off Procedure Using SCF on page 16-22.
•
If the system is down (all processors in the system have been halted, and no
processor is left running to execute SCF commands), use the OSM or TSM Low-
Level Link to power off the system.
See System Power-Off Procedures Using OSM or TSM on page 16-22.
•
In emergency situations, you might need to quickly remove AC power from a
system.
See Emergency Power-Off Procedure on page 16-23.
System Power-Off Procedure Using SCF
For a system in which all the processors but one have been halted, use this procedure
to power off the system:
1. Verify that either processor 0 or processor 1 is still running.
2. Log on to an available TACL command interpreter as the super ID (255,255) and
issue the SCF power-off command:
> SCF CONTROL SUBSYS $ZZKRN, SHUTDOWN
3. Shut off AC power to all peripherals and subsystems.
System Power-Off Procedures Using OSM or TSM
When all the processors in a system have been halted, use one of these two
procedures to power off the system. The procedure you use depends on whether you
have previously chosen the system discovery option.
•
To power off a stopped system before system discovery:
1. Log on to the OSM or TSM Low-Level Link.
2. On the toolbar, click System Power Off.
3. A message box prompts you to confirm the power off system action. To power
off, click OK.
4. Shut off AC power to all peripherals and subsystems.