> On Mon, 23 Jul 2001, Jani Jaakkola wrote:
> > Hmm, I'll guess I have to get my hands on some other benchmark software
> > than bonnie and try it with ext2, xfs+internal log and xfs+external log.
> OK, it seems that create/delete performance on linux XFS with sw RAID is
> still bad with current cvs kernel (not terrible anymore, but bad enough
> that I would not put xfs with sw RAID to production use). I downloaded
> bonnie++ and did some tests
> So the RAID array is 5 times faster in pure write IO, but xfs with
> internal log kills create/delete performance with IO stalls. With external
> log the create/delete performance is again acceptable:
> So the sw RAID internal log performance is not fixed yet :(
No performance is not 'fixed' but it is way better than it was in the
earlier kernels, we had a scenario where it would just stop dead in
its tracks and not make any forward progress.
It is more complex to setup with the external log, but it looks like a
pretty viable solution - see Tru Huynh's numbers with a raid1 journal,
this config still has everything protected and is getting good numbers.
> - Jani