Chapter 3 OpenBoot PROM 29
Note – After forcing the system into OpenBoot firmware control, be aware that
issuing certain OpenBoot commands (probe-scsi, probe-scsi-all,orprobe-
ide) might hang the system.
Graceful Shutdown
The preferred method of obtaining 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.
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 OS is running and the hardware has not experienced
serious failure.
You can also perform a graceful system shutdown from the ALOM command
prompt.
ALOM break or console Command
Typing break from the sc> prompt forces the server to change to OpenBoot
firmware control. If the operating system is already halted, you can use the console
command instead of break to reach the ok prompt.
Stop-A Keys or Break Key
When it is impossible or impractical to shut down the system gracefully, you can
obtain the ok prompt by typing the Stop-A key sequence from a Sun keyboard. If
you have an alphanumeric terminal attached to the server, press the Break key.
Note – These methods of reaching the ok prompt will only work if the system
console has been redirected to the appropriate port.
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