Jesse Keating wrote on Friday 29 April 2005 09:11: > On Fri, 2005-04-29 at 11:18 -0400, Joshua Baker-LePain wrote: > > Err, really? I saw exactly the opposite. Now, this was on centos 4, > > but > > these numbers are for a software RAID0 across 2 9500-12 cards in 11 > > disk > > RAID5 mode. I'd also done 'blockdev --setra 16384' on both 3ware > > devices, and this is with a kernel modified to include XFS: > > I can't help but wonder if the software RAID 0 is interfering with your > setup. Any chance you can test w/out the software RAID 0 involved? > Just a straight RAID 5 across 11 disks? Just last night I did essentially that on my system with a 9500S-12 with 11-disk hw RAID5 + hot spare. The command I ran was: sync ; time dd if=/dev/zero of=/scratch1/8G-2 bs=1M count=8192 ; time sync Typical rate for the dd was 12-15MB/sec, right in line with what Joshua saw (he saw roughly double this for two such arrays RAID0'd together). This rate is terrible, no? :) I chose to write an 8GB file because the system memory is 4GB. I made several other observations on this system; I made lengthy comments on https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=121434. I can run other tests; I'm open to suggestions. Since this box has a second identical array, I plan to try that one with sw RAID5 instead of hw RAID5. My test was to an XFS filesystem, using a RHEL4 kernel modified to have XFS enabled (much like Joshua, I suspect). I don't have numbers for earlier firmware/drivers. David -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx http://www.redhat.com/mailman/listinfo/fedora-devel-list
