01-21-2010
cd /var/crash/`hostname`
any files in there?
once the system is up, what do you see in the messages file, prior to the system going down?
what h/w model are you using? Is the firmware upgraded to the recommended or whichever latest?
Does the system run on only one power supply?
How often that the system goes down?
What do you mean by crash? you saw the panic string when the system come down or it just powered off or just dropped to ok> prompt?
Are the boot disks mirrored? Any errors that you find on the OS? Be it HDD problem or whatever..
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CRASH(8) BSD System Manager's Manual CRASH(8)
NAME
crash -- examine and debug system images
SYNOPSIS
crash [-M core] [-N kernel]
DESCRIPTION
The crash command is used to examine and debug system images.
If run without any arguments, crash operates on the running system.
The options are as follows:
-M core Operate on the specified crash dump instead of the default /dev/mem. Crash dumps should be from the same version of the system
and same machine architecture as the running version of crash, and must be uncompressed.
-N kernel Extract the name list from the specified kernel instead of the default /dev/ksyms.
The command syntax used by crash is the same as the in-kernel debugger. See the ddb(4) manual page for more information.
Operations and facilities that require a running system, such as breakpoints, are not supported by crash.
crash does not provide pagination. However, by using the pipe symbol, output may be sent to commands available from the shell. For example:
crash> ps | more
crash> ps | grep ioflush
SEE ALSO
ps(1), vmstat(1), ddb(4), pstat(8)
HISTORY
The crash command appeared in NetBSD 6.0.
BSD
March 7, 2009 BSD