28 Netra T2000 Server Administration Guide • September 2006
■ During the boot process, when there is a serious hardware problem that prevents
the operating system from running, the system reverts to OpenBoot firmware
control.
■ When a serious hardware problem develops while the system is running, the
operating system transitions smoothly to run level 0.
Before You Obtain the ok Prompt
Note – Accessing the ok prompt suspends the Solaris OS. Before suspending the
operating system, you should back up files, warn users of the impending shutdown,
and bring the system down in an orderly manner.
Caution – When you access the ok prompt from a functioning 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, in general, each time you
obtain the ok prompt, you should expect to have to reboot the system to get back to
the operating system.
Obtaining the ok Prompt
There are several ways to obtain the ok prompt. In order of desirability, these are:
■ Graceful shutdown
■ ALOM break and console command
■ Stop-A keys or Break key
■ Manual system reset
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