Alom Cmt Break Or Console Command; L1-A (Stop-A) Keys Or Break Key; Manual System Reset - Sun Microsystems SPARC Enterprise T1000 Administration Manual

ALOM CMT break or console Command

Typing break from the sc> prompt forces a running server to drop into OpenBoot
firmware control. If the operating system is already halted, you can use the console
command instead of break to reach the ok prompt.
Caution – After forcing the system into OpenBoot firmware control, be aware that
issuing certain OpenBoot commands (like probe-scsi, probe-scsi-all, or
probe-ide) might hang the system.

L1-A (Stop-A) Keys or Break Key

When it is impossible or impractical to shut down the system gracefully, you can get
to the ok prompt by typing the L1-A (Stop-A) key sequence from a keyboard
connected to the server (that is, if OpenBoot input-device=keyboard). If you
have an alphanumeric terminal attached to the server, press the Break key.
Caution – After forcing the system into OpenBoot firmware control, be aware that
issuing certain OpenBoot commands (like probe-scsi, probe-scsi-all, or
probe-ide) might hang the system.

Manual System Reset

Caution – Forcing a manual system reset results in loss of system state data, and
should be attempted only as a last resort. After a manual system reset, all state
information is lost, which inhibits troubleshooting the cause of the problem until the
problem reoccurs.
Use the system controller reset command, or poweron and poweroff commands,
to reset the server. Reaching the ok prompt by performing a manual system reset or
by power-cycling the system should be the method of last resort. Using these
commands result in the loss of all system coherence and state information. A manual
system reset could corrupt the server's file systems, although the fsck command
usually restores them. Use this method only when nothing else works.
Caution – Accessing the ok prompt suspends the Solaris OS.
20 Sun SPARC Enterprise T1000 Server Administration Guide • April 2007