Re: 3ware 9650 tips

Bernd Schubert
2007-07-16T13:05:19Z

On Monday 16 July 2007 14:22:25 David Chinner wrote:
> You can see from the ext3 graph that it comes to a screeching halt
> every 5s (probably when pdflush runs) and at all other times the
> seek rate is >10,000 seeks/s. That's pretty bad for a brand new,
> empty filesystem and the only way it is sustained is the fact that
> the disks have their write caches turned on. ext4 will probably show
> better results, but I haven't got any of the tools installed to be
> able to test it....

I recently did some filesystem throuput tests, you may find it here

http://www.pci.uni-heidelberg.de/tc/usr/bernd/downloads/lustre/performance/

ldiskfs is ext3+extents+mballoc+some-smaller-patches, so is almost ext4
(delayed allocation is still missing, but the clusterfs/lustre people didn't
port it and I'm afraid of hard to detect filesystem corruptions if I include
it myself).

Write performance is still slower than with xfs and I'm really considering to
try to use xfs in lustre.

Cheers,
Bernd

--
Bernd Schubert
Q-Leap Networks GmbH