Filter
Top Products
50 Sun Fire V490 Server Administration Guide • August 2004
What You Should Know About Accessing the ok
Prompt
It is important to understand that when you access the ok prompt from a
functioning Sun Fire V490 system, you are suspending the Solaris OS software and
placing the system under firmware control. Any processes that were running under
the Solaris OS software are also suspended, and the state of such processes may not be
recoverable.
The firmware-based tests and 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 Solaris OS software from the point at which it was
suspended. Although the go command will resume execution in most circumstances,
in general, each time you drop the system down to the ok prompt, you should
expect to have to reboot it to get back to the Solaris OS environment.
As a rule, before suspending the Solaris OS software, 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.
Ways of Reaching the ok Prompt
There are several ways to get to the ok prompt, depending on the state of the system
and the means by which you are accessing the system console. In order of
desirability, these are:
■ Graceful halt
■ Stop-A or Break key sequence
■ Externally initiated reset (XIR)
■ Manual system reset
A discussion of each method follows. For instructions, see “How to Get to the ok
Prompt” on page 126.
Graceful Halt
The preferred method of reaching the ok prompt is to halt the operating system
software by issuing an appropriate command (for example, the shutdown, init,
halt,oruadmin command) as described in Solaris system administration
documentation.