Mysterious reboots on R390

[Chris Campbell_10]

I've been having some random reboots on an R390 server. The machine has been
my responsibility for the past month and has had about 4 random reboots. The
guy who took care of it before I did said he had that happen to him a couple of
times too. The first three reboots I experienced were with me standing in
front on the machine doing something to it. The third happened when I wasn't
even logged in. dtlogin was up on the screen and I was putting the front cover
back on. In all of the cases (well I don't know about the last one), it killed
everything on the spot and sync'ed the disks, then rebooted. The shutdown
response was the same as you get on any HP-UX machine by running /sbin/reboot
or hitting the power switch on a machine with soft powerdown (except that when
it was done, it rebooted instead of powering down). The first three incidents
lead me to believe that it could be the switch on the front of the R390, but
last Wednesday, it rebooted at 9 P.M., when there was no one in the room to
bump the ma
chine or do anything to affect a faulty switch.

[Melvyn Burnard_1]

This could very possibly be a faulty power switch, or even a board in the
system itself.
I would recommend getting HP Hardware Support to investigate the system.

[Chris Campbell_10]

We had the switch replaced by HP and after the repair guy left, the machine
crashed... HARD. I had to pull the plug. When I brought it back up with HP
tech support on the phone, the firmware gave a CPU1 fault. I was able to take
the CPU off line and the machine ran fine on CPU0 until today when HP came back
and replaced the faulty CPU. So it appears this may have been the whole
problem.