FUJITSU T5140 - Manual (Page 49)

Chapter 1 Configuring the System Console 27
Note – These methods of reaching the ok prompt will only work if the system
console has been left in the default setting of virtual-console. For details, see
“System Console OpenBoot Configuration Variable Settings” on page 29 .
Manual System Reset
Caution – Forcing a manual system reset results in loss of system state data, and
should be attempted only as a last resort. After a manual system reset, all state
information is lost, which inhibits troubleshooting the cause of the problem until the
problem reoccurs.
Use the ILOM service processor reset /SYS command, or start /SYS and
stop /SYS
commands, to reset the server. Reaching the ok prompt by performing a
manual system reset or by power-cycling the system should be the method of last
resort. Using these commands results in the loss of all system coherence and state
information. A manual system reset could corrupt the server’s file systems, although
the fsck command usually restores them. Use this method only when nothing else
works.
Caution – Accessing the ok prompt suspends the Solaris OS.
When you access the ok prompt from a functioning SPARC Enterprise T5140 or
T5240 server, you are suspending the Solaris OS and placing the system under
firmware control. Any processes that were running under the operating system are
also suspended, and the state of such processes might not be recoverable.
The commands you run from the ok prompt have the potential to affect the state of
the system. This means that it is not always possible to resume execution of the
operating system from the point at which it was suspended. Although the go
command will resume execution in most circumstances, each time you obtain the ok
prompt, you should expect to have to reboot the system to get back to the operating
system.