Hi (or "ok, hi"),
Paul Harmor wrote on 01.01.2007 at 20:51:43 [[BackupPC-users] OK, how about
changing the server's backuppc process niceness?]:
> I'm running a 1.3Gig Duron, 512 DDR, LVM and 2x160GB drives, on Ubuntu 6.10.
while that's a nice start and possibly hints at a memory bottleneck, the
more interesting detail would be your BackupPC setup. Are you using 'rsync'
as transfer method? How fast is your network? What are you backing up (type
of host, backup volume, approximately how many files, full or incremental ...)?
What commands are started exactly? See the log files for details. At which
point exactly does the problem appear? What can you find out about what the
processes are doing at this point? How high is your hard disk activity at
this point? How large and how full is the partition your pool is on? What
kind of FS are you using? Any possibly related errors in /var/log/messages
such as hard disk failures?
> I have only 2 machines (at the moment) being backed up, but every time
> the backups start, the server system slows to an UNUSEABLE crawl, until
> I can, slowly, start top, and renice the 4 backuppc processes.
>
> Any way to make them start nicer, to begin with?
Well, yes. Does that answer your question? ;-)
I'm not sure that solves your issue though. It may be a kludge, provided it
really *does* make your server usable. If your BackupPC daemon process is
started reniced, its children will inherit the value. Depending on what you
mean by 'the 4 backuppc processes', you might, alternatively, be able to add
a 'nice -n 4' (or whatever value) to the respective ClientCmd (presuming
you're backing up localhost as one of the two machines).
I wouldn't be surprised, though, if your problem is either not CPU related
or caused by a misconfiguration if it really is. Please someone correct me
if I'm wrong, but a 1.3 GHz Duron doesn't sound slow enough by far to me to
be legitimately overloaded by 2 backups. 512MB of memory maybe, but renicing
wouldn't help then, would it?
Have you tried what happens, if you only run *one* backup at a time
("$Conf{MaxBackups} = 1;")?
Regards,
Holger
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