Date: Sun, 29 Oct 2006 17:58:44 -0000 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Petri Helenius" <pete@he.iki.fi>, <performance@freebsd.org>, "Steve Peterson" <stevep-hv@zpfe.com> Subject: Re: gvinum raid5 performance seems slow Message-ID: <003f01c6fb83$e4b96280$b3db87d4@multiplay.co.uk> References: <6.2.3.4.0.20061027180329.020bed68@localhost><4542D941.2070204@centtech.com><6.2.3.4.0.20061028124559.02105930@localhost><4543AD35.30205@he.iki.fi> <6.2.3.4.0.20061029095927.05833580@localhost>
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Steve Peterson wrote:
> I guess the fundamental question is this -- if I have a 4 disk
> subsystem that supports an aggregate ~100MB/sec transfer raw to the
> underlying disks, is it reasonable to expect a ~5MB/sec transfer rate
> for a RAID5 hosted on that subsystem -- a 95% overhead.
Absolutely not, when I was investigating RAID5 performance the quickest
option I found was linux's software RAID which gave performance of
270MB/s iirc across 5 * 400Gb Disks on a Highpoint 1820a.
While doing this I gave givnum a quick test and saw similar results
as you so gave up with it as I didnt have time to investigate further.
Steve
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