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UNIX for Dummies Questions & Answers
Sun Machine Rebooted
Post 6459 by rwb1959 on Wednesday 5th of September 2001 08:03:43 AM
09-05-2001
gremlins!
You gotta love a mistery 
I can tell you that over the years, I have
expierenced these type of "gremlins" on
several occasions on all types of hardware.
In one case, we expierenced unknown crashes
about once every 30 or 40 days.
I just started pulling each board
one by one to examine them closely and I found
one with a deep gash across several of the onnector pins at the card edge. I actually
dabbed a bit of solder on each scratched
connector and the problem was never expierenced
again.
When ever I see these unexplained crashes, I
just shut the machine down and go into it and
reseat all the boards, memory and connectors
and the results are more often that the problem
never surfaces again. That's not to say you
should skip running diags. though. Running them
can point you in the right direction if not
actually find the problem.
Good hunting
I can tell you that over the years, I have
expierenced these type of "gremlins" on
several occasions on all types of hardware.
In one case, we expierenced unknown crashes
about once every 30 or 40 days.
I just started pulling each board
one by one to examine them closely and I found
one with a deep gash across several of the onnector pins at the card edge. I actually
dabbed a bit of solder on each scratched
connector and the problem was never expierenced
again.
When ever I see these unexplained crashes, I
just shut the machine down and go into it and
reseat all the boards, memory and connectors
and the results are more often that the problem
never surfaces again. That's not to say you
should skip running diags. though. Running them
can point you in the right direction if not
actually find the problem.
Good hunting
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LEARN ABOUT OSF1
reboot
reboot(8) System Manager's Manual reboot(8) NAME
reboot - Restarts the machine SYNOPSIS
/usr/sbin/reboot [-dlnq] DESCRIPTION
When the system is running and multiple users are logged in, use the shutdown -r command to perform a reboot operation. If no users are logged in, use the reboot command. The reboot command normally stops all running processes, syncs the disks, logs the reboot, and writes a shutdown entry in the login accounting file, /var/adm/wtmp. The reboot command uses the sync call to synchronize the disks, and to perform other shutdown activities such as resynchronizing the hard- ware time-of-day clock. After these activities, the system reboots. By default, the system starts and the file systems are automatically checked. If the start-up activities are successful, the system comes up in the default run-level. You must have root privileges to use this command. Using the -n flag can result in file system damage. FLAGS
Generates a crash dump of the system before halting it. Can be used with any of the other flags. Does not log the reboot using syslog Does not sync the disks or log the reboot using syslog Performs a quick reboot without first shutting down running processes; does not log the reboot using syslog EXAMPLES
To enable the default reboot action, enter: reboot This command causes the system to stop all running processes, sync the disks, log the shutdown, and perform other routine shutdown and reboot activities. To shut down the system without logging the reboot, enter: reboot -l This command shuts down the system and performs all shutdown and reboot activities, except logging the shutdown. To reboot the system abruptly, enter: reboot -q This command reboots the system abruptly without shutting down running processes. FILES
Specifies the command path Specifies the login accounting file Specifies the path of the syslog daemon RELATED INFORMATION
Commands: fsck(8), halt(8), init(8), savecore(8) shutdown(8), syslogd(8) Functions: reboot(2), sync(2), syslog(3) delim off reboot(8)