Date: Thu, 16 Feb 2006 10:27:39 -0500 From: "Tamouh H." <hakmi@rogers.com> To: <freebsd-questions@freebsd.org> Subject: RE: Mysterious reboot Message-ID: <20060216152822.E343D43D46@mx1.FreeBSD.org> In-Reply-To: <021b01c63309$ab353130$0401a8c0@Mike8500>
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>=20 > Alex de Kruijff <mailto:freebsd@akruijff.dds.nl> wrote: > > On Thu, Feb 16, 2006 at 01:46:19AM -0600, Mike Loiterman wrote: > >> Afte being up for more than two months, I just noticed that my ver=20 > >> reliable and stable server mysteriously rebooted. I've > had the same > >> hardware and system setup for more than a year and haven't ever=20 > >> experienced anything like this before. I haven't added any new=20 > >> hardware in a very long time. I did upgrade mysql this > morning via > >> portupgrade, however. > >>=20 > >> The system appears to have crashed, as dmesg shows that > the various > >> filesystems weren't unmounted correctly upon reboot, but > aside from > >> that single error, nothing else points to what the problem was. > >>=20 > >> /var/log/messages just shows a user connectig via pop, and > then the > >> next line is the machine booting. > >>=20 > >> We are having a pretty good rainstorm, but nothing else > seems to have > >> lost power and I have several other machines in this space > that did > >> not go down (servers, TVs, XBOX, laptops, etc). > >>=20 > >> The machine seems to have gone down around 11:23 PM, so I checked=20 > >> /etc/cron to see if I had scheduled a job to be run at > that time, but > >> there are no jobs scheduled to be run on or near this time. > >>=20 > >> Where can I begin to look for more clues as to why this > machine seems > >> to have crashed? Where would a kernel core dump be or a > mysql core > >> dump? > >=20 > > You can look at /var/log/messages and find core files with 'find /=20 > > -name \*.core' > >=20 >=20 > The only real explanation was some sort of power fluctuation.=20 > I'll continue to monitor it carefully, but there doesn't seem to be=20 > anyway to definitivly identify the cause, but the machine crashing=20 > under load is looking less and less likely. >=20 > If there is a problem, I suspect it will show up again within the next = > week or so, otherwise I'll chalk it up to a random event in the=20 > unverse. I have had the exact issue with a dual xeon and FreeBSD 5.4 with 4GB = RAM. It was working perfectly fine and after a month or two all the = sudden the machine rebooted by itself. Well, I shouldn't say all the = sudden, one of the circuit breakers blow up taking the server down, but = since that time , the server would do sudden reboots. No errors, no dumps, no panics. Just a simple reboot. Then it started = becoming more often (it reboots every 15 days, then 10 days, then 5 = days). So I began to suspect it is a power issue. We use a remote reboot power switch, so I moved it to another socket, = and so far 20 days, no reboots. Not sure if it will go crazy again, but = I hope it doesn't. The power supply is 500W so should be more than sufficient for 4 SCSI = drives and dual xeons.
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