FUJITSU T5140 - Manual (Page 47)

Chapter 1 Configuring the System Console 25
■ When a serious hardware problem develops while the system is running, the
operating system transitions smoothly to run level 0.
■ When you deliberately place the system under firmware control in order to
execute firmware-based commands.
The last scenario most often concerns you as an administrator, since there will be
times when you need to reach the ok prompt. Several ways to do this are outlined in
“Reaching the ok Prompt” on page 25 . For detailed instructions, see “Reaching the
ok Prompt” on page 25 .
Reaching the ok Prompt
There are several ways to reach the ok prompt, depending on the state of the system
and the means by which you are accessing the system console. In decreasing order of
desirability, these are:
■ Graceful shutdown
■ Break key
■ ILOM service processor set /HOST send_break_action=break and
start /SP/console
command pair
■ Manual system reset
A discussion of each method follows. For step-by-step instructions, see “Reaching
the ok Prompt” on page 25 .
Note – As a rule, before suspending the operating system you should back up files,
warn users of the impending shutdown, and halt the system in an orderly manner.
However, it is not always possible to take such precautions, especially if the system
is malfunctioning.
Graceful Shutdown
The preferred method of reaching the ok prompt is to shut down the operating
system by issuing an appropriate command (for example, the shutdown, init, or
uadmin
command) as described in Solaris system administration documentation.
Gracefully shutting down the system prevents data loss, enables you to warn users
beforehand, and causes minimal disruption. You can usually perform a graceful
shutdown, provided the Solaris OS is running and the hardware has not experienced
serious failure.
You can perform a graceful system shutdown from the ILOM service processor
command prompt using the stop /SYS command.