ZFS performance

[Ståle Kristoffersen]

On 2007-05-29 at 14:54, Kris Kennaway wrote:
> On Tue, May 29, 2007 at 01:12:18AM +0200, St?le Kristoffersen wrote:
> > On 2007-05-14 at 10:42, Nick Gustas wrote:
> > > I see the same behavior that St?le is seeing, I can "fix" it by setting 
> > > vfs.zfs.prefetch_disable="1" in loader.conf.  I'm assuming something in 
> > > the prefetch code isn't quite right?
> > 
> > Ah, this _greatly_ improved the usability of my fileserver! Thanks for the
> > tip :)
> 
> How does filesystem performance change?  I thought ZFS needs to do
> prefetching to improve read performance.

How the performance changed was dramatically, it went from beeing about
useless for doing anything other than watching one stream from it, to
tackle several concurrent streams without problems. I whish prefetching
would work correctly, it should improve performance even more.
-- 
Ståle Kristoffersen
staalebk at ifi.uio.no