Sun Microsystems Sun Fire V440 Diagnostics And Troubleshooting Manual page 190

It is the last of these scenarios that most often concerns you as an administrator,
since there will be times when you need to reach the ok prompt. The several ways to
do this are outlined in "Ways of Reaching the ok Prompt" on page 172. For detailed
instructions, see "How to Get to the ok Prompt" on page 176.
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 shutdown of the Solaris operating environment
ALOM system controller break or console command
L1-A (Stop-A) keys or Break key
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 176.
Graceful Shutdown
The preferred method of reaching the ok prompt is to shut down the operating
environment by issuing an appropriate command (for example, the shutdown,
init, or uadmin command) as described in Solaris system administration
documentation. You can also use the system Power button to initiate a graceful
system shutdown.
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 operating environment is running and the hardware
has not experienced serious failure.
You can also perform a graceful system shutdown from the ALOM system controller
command prompt.
For more information, see the Sun Fire V440 Server Administration Guide.
ALOM System Controller break or console Command
Typing break from the sc> prompt forces a running Sun Fire V440 system to drop
into OpenBoot firmware control. If the operating system is already shut down, you
can use the console command instead of break to reach the ok prompt.
172 Sun Fire V440 Server Diagnostics and Troubleshooting Guide • July 2003