Hello,
09.07.2009 16:03, Stoyan Petkov wrote:
> Hello,
>
> I've an FD that's making too much iowait on the backed up machine. I
> tried searching info on the subject but nothing useful comes up. Here is
> an excerpt from the top utility:
>
> top - 18:55:25 up 50 days, 1:48, 23 users, load average: 0.30, 0.32, 0.83
> Tasks: 124 total, 1 running, 123 sleeping, 0 stopped, 0 zombie
> Cpu0 : 2.0%us, 1.0%sy, 0.0%ni, 96.0%id, 0.0%wa, 1.0%hi, 0.0%si,
> 0.0%st
> Cpu1 : 2.9%us, 1.0%sy, 0.0%ni, 96.1%id, 0.0%wa, 0.0%hi, 0.0%si,
> 0.0%st
Unless I'm mistaken, there's not much iowait displayed here. Quite the
contrary: 96% idle.
> Mem: 1032680k total, 1016456k used, 16224k free, 18468k buffers
> Swap: 2031608k total, 103044k used, 1928564k free, 645912k cached
>
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> 22534 root 20 0 41560 2268 1232 S 6.0 0.2 0:06.32 bacula-fd
> -c /etc/bacula/bacula-fd.conf
> 22758 root 20 0 2364 1044 812 R 1.0 0.1 0:01.40 top
>
>
> During normal operation the iowait will stay within 10% limits, however,
> at some point it jumps to 90-98% and stays that way. I've noticed that
> even with canceling the job from the director,
Have you tried vmstat, and checked - perhaps using ps - which
processes do need lots of CPU time when there's so much iowait occuring?
Arno
> the iowait on the client will stay at the 90% level.
> The client is running on Fedora core 9:
>
> Linux 2.6.27.9-73.fc9.i686 #1 SMP Tue Dec 16 15:25:05 EST 2008 i686
> i686 i386 GNU/Linux
> Fedora release 9 (Sulphur)
>
> I've installed the FD through yum.
>
> Can anyone help with more info to what might be causing the problem or
> where I can find more info on iowait optimizations?
>
> Thank you for your help!
>
> Cheers,
>
> Stoyan
>
>
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--
Arno Lehmann
IT-Service Lehmann
Sandstr. 6, 49080 Osnabrück
www.its-lehmann.de
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