--On Friday, March 19, 2004 18:00:01 +0000 Simon Lorenz <simon.lorenz AT
fresca.co DOT uk> wrote:
> I have a Solaris 8 system running Amanda that ginds to a hault when the
> backups are running. Amanda and the sub processes take all avliable CPU.
> This is dispite having compression set to none (using tape device). It is
> primarily the snedbackup, dumper and ufsrestore processes that are causing
> trhe issue.
>
> Any suggestions for stopping this would be much appreciated.
>
> load averages: 2.21, 2.21, 2.02
> 17:48:54
> 142 processes: 131 sleeping, 5 running, 1 zombie, 4 stopped, 1 on cpu
> CPU states: 0.0% idle, 13.7% user, 76.9% kernel, 9.3% iowait, 0.0% swap
> Memory: 768M real, 13M free, 729M swap in use, 3911M swap free
The part that looks odd to me is the high kernel CPU usage. I would
expect to see mostly user and iowat usage while running the backups.
Are you backing up NFS or vxfs filesystems? Both of those drivers use
kernel time, although I wouldn't expect the usage to be quite that high.
How many dumps are you running in parallel? Perhaps reducing that number
would give you an overall speedup
Frank
>
> PID USERNAME THR PRI NICE SIZE RES STATE TIME CPU COMMAND
> 10563 amanda 1 22 0 2232K 936K sleep 5:32 35.03% sendbackup
> 10476 amanda 1 0 19 2640K 1920K run 2:26 15.04% dumper
> 10568 amanda 1 32 0 11M 9928K sleep 1:49 12.55% ufsrestore
> 10572 amanda 1 48 0 11M 2864K run 0:47 5.20% ufsdump
> 10571 amanda 1 53 0 11M 2864K run 0:48 5.16% ufsdump
> 10573 amanda 1 48 0 11M 2872K run 0:47 4.64% ufsdump
> 10574 amanda 1 36 0 11M 3072K sleep 0:32 3.53% ufsdump
> 10570 amanda 1 48 0 11M 7520K sleep 0:20 1.89% ufsdump
> 10646 root 1 58 0 2104K 1208K cpu 0:01 0.35% top
>
>
> Simon
--
Frank Smith fsmith AT hoovers DOT com
Sr. Systems Administrator Voice: 512-374-4673
Hoover's Online Fax: 512-374-4501
|
