Holger Parplies wrote:
> Hi,
>
> Les Mikesell wrote on 2009-06-21 18:53:52 -0500 [Re: [BackupPC-users]
> backuppc_dump hangs server]:
>
> > error403 wrote:
> >
> > > Well, I tried to renice the process while a backup was in process, but no
> > > go.
> > >
> > > It hung again, this time after about 25 minutes of running backuppc_dump.
> > >
> > > Any other ideas? Thanks
> > >
> >
> > It is almost certainly hardware since it only happens on that machine.
> > Rsync
> > can consume large amounts of RAM - but that should go to swap and just slow
> > down.
> >
>
> according to the original post it doesn't seem to be an issue of the amount of
> memory (I'm not saying "memory issue" because *faulty* memory could be a
> cause). My next suspect would be the power supply. BackupPC puts a
> simultaneous load on CPU and disk subsystem, which could cause the PSU to
> reach its limits and the CPU to hang as the voltage goes out of spec. I
> wouldn't rule out CPU overheating completely yet. A CPU is made up of a number
> of functional units, which can operate in parallel if programmed correctly. A
> (compiled) "while (1) ;" won't do that. Either will BackupPC, but it might be
> causing different parts of the CPU to run hot than your test program. The
> point is, you should really measure the case that is giving you problems
> before ruling out the cause (if your test program had crashed the machine,
> that would have been "good enough" evidence, but it failing to do so is not).
> You could either try installing the "lm-sensors" package(*) and see if that
> gives you meaningful readings, or at least check the temperature values in
> the BIOS immediately on reboot after a crash (you won't see the actual value
> during the crash, but it should be close enough to tell you whether your CPU
> temperature is worryingly high or boringly low). Both sources should also
> give you PSU voltage readings.
>
> There was a post on the list a while back on how to test your PSU. If you've
> got a spare and suitable PSU (e.g. in a second computer) the easiest solution
> would be to swap it and see if that changes anything.
>
> Good luck.
>
> Regards,
> Holger
>
> (*) You need to run "sensors-detect" once, modprobe the detected modules (and
> add them to /etc/modules if you want them to be automatically loaded in
> the future), and then run "sensors" to see the values.
>
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Hi again,
Before I start dismantling my power supply, what is the highest log level for
backuppc and rsync? I will try to see what's the last thing that made it crash
if I can replicate it over many crashes.
Thanks,
Phil
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