From: Nat Makarevitch <nat@makarevitch.org>
To: linux-raid@vger.kernel.org
Subject: Re: Linux MD RAID 5 Benchmarks Across (3 to 10) 300 Gigabyte Veliciraptors
Date: Wed, 11 Jun 2008 17:02:28 +0000 (UTC) [thread overview]
Message-ID: <loom.20080611T164646-549@post.gmane.org> (raw)
In-Reply-To: alpine.DEB.1.10.0806071015110.23323@p34.internal.lan
Justin Piszcz <jpiszcz <at> lucidpixels.com> writes:
> Ever wonder what kind of speed is possible with 3 disk, 4,5,6,7,8,9,10-disk
RAID5s?
> Here are the bonnie++ results:
>
http://home.comcast.net/~jpiszcz/20080607/raid5-benchmarks-3to10-veliciraptors/veliciraptor-raid.html
Why does the amount of spindles has nearly no effect on the amount of seeks per
second?
3 disks: 713.9 seeks/s (AFAIK the Raptor works at 10000 rpm, getting 230+
seeks/s is astonishing)
10 disks: 705.5 seeks/s (same as 3 disks?!)
Did I miss something? Or did you use a very large stripe size (to the point of
forbiding the 16 GB file used to span over all spindles?)? Or is it some glitch
in the RAID code (I don't think so, on a RAID10 with 10 low-end disk I obtained
~1000 IOPS: http://www.makarevitch.org/rant/raid/#3wmd)?
next prev parent reply other threads:[~2008-06-11 17:02 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-07 14:22 Linux MD RAID 5 Benchmarks Across (3 to 10) 300 Gigabyte Veliciraptors Justin Piszcz
2008-06-07 15:54 ` David Lethe
2008-06-08 1:46 ` Dan Williams
2008-06-09 7:51 ` thomas62186218
2008-06-09 8:43 ` Keld Jørn Simonsen
2008-06-09 13:41 ` David Lethe
2008-06-09 14:27 ` Keld Jørn Simonsen
2008-06-09 14:56 ` David Lethe
2008-06-09 23:15 ` Keld Jørn Simonsen
2008-06-11 17:02 ` Nat Makarevitch [this message]
2008-06-11 20:27 ` Bill Davidsen
2008-06-11 20:48 ` Justin Piszcz
2008-06-11 20:53 ` Justin Piszcz
2008-06-12 19:08 ` Bill Davidsen
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