On Thu, Jul 19, 2001 at 11:17:58AM -0500, Steve Lord wrote:
> If you choose another partition (non raid5) for the log and make an external
> log instead of using an internal log then the issue should go away, we
> are going to test this here.
I built a 2.4.7-pre8-xfs kernel from CVS + qlogicfc (from Data
Foundation Inc.) and installed that on our test system with a 51GB RAID5
using 7 disks, no spares.
I started out using an internal log. I used the OpenBSD 2.9 source
tarball as test data to extract to the RAID over NFS. The internal log
performance was pretty poor. It took me about 13 minutes to extract the
whole thing and I got sick of waiting for the `rm -r` so I stopped it
early and removed it locally, which was still slow.
I remade the file system with an external 100M log. Extracting took
1:45 (that 1 minute, 45 seconds). Removal took 4:27. Still not the
best, but considerably better. I still noticed some stalls along the
way. XFS writes fluctuated between 1 MB/s and 5 MB/s. Removes where
going at about 150/s.
Granted, I'm using a totally different driver than I was before. I'm
going to work on getting the official (beta 4.27) Qlogic driver working.
Nate Straz nstraz@xxxxxxx
sgi, inc http://www.sgi.com/
Linux Test Project http://ltp.sf.net/