On 21/06/10 10:56, Lukas Kolbe wrote:
>
> For comparison, I dd'ed a volume to /dev/null while the copy job was
> running:
> [root@shepherd ~]# dd if=/var/bacula/dp/fs1/Vol0070 of=/dev/null bs=1M
> 9175040000 bytes (9.2 GB) copied, 12.0225 seconds, 763 MB/s
>
> But dd'ing it to another file reveals a problem with the storage
> subsystem I believe:
>
> [root@shepherd ~]# dd if=/var/bacula/dp/fs1/Vol0070 of=/var/bacula/dp/fs2/xxx 
> bs=1M
> 849346560 bytes (849 MB) copied, 32.665 seconds, 26.0 MB/s
>
>    

Try separate raid arrays.

FWIW I have 51245s here and their performance is _much_ better than 
that.  Only the 6 disk raid6 array gets close to that and it's primarily 
spindle/headseek limited.





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