09-02-2011
Some application crashes might system bring system down with unexpected shutdown due, But I'm not sure if excessive load on processor might crash the OS to shutdown unexpectedly especially in AIX never been in such situations. If you are concerned and the system is critical to you and this is not the first occurrence of unexpected shutdown try to call IBM and investigate with them .
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LEARN ABOUT OPENSOLARIS
poweroff
halt(1M) System Administration Commands halt(1M)
NAME
halt, poweroff - stop the processor
SYNOPSIS
/usr/sbin/halt [-dlnqy]
/usr/sbin/poweroff [-dlnqy]
DESCRIPTION
The halt and poweroff utilities write any pending information to the disks and then stop the processor. The poweroff utility has the
machine remove power, if possible.
The halt and poweroff utilities normally log the system shutdown to the system log daemon, syslogd(1M), and place a shutdown record in the
login accounting file /var/adm/wtmpx. These actions are inhibited if the -n or -q options are present.
OPTIONS
The following options are supported:
-d Force a system crash dump before rebooting. See dumpadm(1M) for information on configuring system crash dumps.
-l Suppress sending a message to the system log daemon, syslogd(1M), about who executed halt.
-n Prevent the sync(1M) before stopping.
-q Quick halt. No graceful shutdown is attempted.
-y Halt the system, even from a dialup terminal.
FILES
/var/adm/wtmpx History of user access and administration information.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
dumpadm(1M), init(1M), reboot(1M), shutdown(1M), sync(1M), syslogd(1M), inittab(4), attributes(5), smf(5)
NOTES
The halt and poweroff utilities do not cleanly shutdown smf(5) services. Execute the scripts in /etc/rcnum.d or execute shutdown actions in
inittab(4). To ensure a complete shutdown of system services, use shutdown(1M) or init(1M) to reboot a Solaris system.
SunOS 5.11 2 Nov 2004 halt(1M)