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Re: amanda performance
2005-12-16 11:52:07
On Fri, 16 Dec 2005 at 9:22am, Roy Heimbach wrote
We have amanda 2.4.5p1 server running under debian linux on a dual
opteron that's driving a new overland tape library with an ultrium3
drive. For now, the holding disk is a dedicated local 120 GB drive.
A single drive is going to have an awfully hard time... scratch that. A
single drive can *not* feed an lto3 drive as fast as it wants to be fed
(even if that's the only thing it's trying to do). I've got a 4 disk
hardware RAID0 feeding my lto3 drive.
There's an amanda 2.4.5p1 client also running under debian linux on
another dual opteron that's connected to the amanda server host via
a dedicated gig network. This host is a moderately loaded fileserver
with hardware raid.
Backing up a 10 GB test partition, we're seeing dumper and taper
performance around 2.5 MB/sec, a fraction of what the hardware is
capable of.
*snip*
Any suggestions would be welcome.
Priority one is to figure out where the slowdown is. Bench the hardware
RAID with something like bonnie++ and/or tiobench. Ditto for the holding
disk. Use tar to write /dev/zero (using your chosen blocksize) to the
tape drive. Then, do a test amdump to holding disk. Amflush that dump.
--
Joshua Baker-LePain
Department of Biomedical Engineering
Duke University
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