Joshua Baker-LePain wrote:
On Thu, 29 Mar 2007 at 12:17pm, chrism@xxxxxxxxx wrote
I keep hearing about this "slowness" thing. Here is a bonnie++ run on
one of my spare machines. This particular machine is also running 4
copies of Folding@Home in the background during the test. The array
being tested is on a 3Ware 9550 card with 8 500gig barracudas. The
filesystem is a standard ext3 filesystem with zero tweaks. It doesn't
appear that slow to me, but perhaps I'm just easy to please.
The problem was particularly pronounced on the 75xx/85xx series cards
(which were not exactly RAID5 speed demons). XFS blew away ext3 on
hardware RAID5 arrays on those cards. I don't have any benchmarks handy
on 95xx series cards, bit I vaguely recall that XFS still performed
better, but not by anywhere near the same margin.
The 75xx and 85xx boards suffered from lack of onboard memory which
meant that they had to wait for the disks to be done before returning
A-OKAY. I am talking about RAID5 arrays as raid1, raid0 and raid10
arrays on these boards were okay. XFS should still wipe the floor with
ext3 on the 95xx series on raid5 arrays due to problems with the code in
the kernel between ext3 and the 3ware driver.
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