Sun Microsystems Sun Fire V480, Руководство администратора

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Chapter 4 Network Interfaces and System Firmware 57
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
■
L1-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 132.
Graceful Halt
The preferred method of reaching the
ok
prompt is to halt the operating
environment software by issuing an appropriate command (for example, the
shutdown
,
init
,
halt
, or
uadmin
command) as described in Solaris system
administration documentation.
Gracefully halting the system prevents data loss, allows you to warn users
beforehand, and causes minimal disruption. You can usually perform a graceful halt,
provided Solaris operating environment software is running and the hardware has
not experienced serious failure.
L1-A or Break Key Sequence
When it is impossible or impractical to halt the system gracefully, you can get to the
ok
prompt by typing the L1-A (or Stop-A) key sequence from a Sun keyboard, or, if
you have an alphanumeric terminal attached to the Sun Fire V480 system, by
pressing the Break key.
If you use this method to reach the
ok
prompt, be aware that issuing certain
OpenBoot commands (like
probe-scsi
,
probe-scsi-all
, and
probe-ide
) may
hang the system.
Externally Initiated Reset (XIR)
Generating an externally initiated reset (XIR) has the advantage of allowing you to
issue the
sync
command to preserve file systems and produce a dump file of part of
the system state for diagnostic purposes. Forcing an XIR may be effective in breaking