linux-kernel - Re: Performance Characteristics of All Linux RAIDs (mdadm/bonnie++)

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Message-ID: <20080528195752.0cdcbc6d@core>
Date:	Wed, 28 May 2008 19:57:52 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"Jens Bäckman" <jens.backman@...il.com>
Cc:	"Justin Piszcz" <jpiszcz@...idpixels.com>,
	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
	xfs@....sgi.com
Subject: Re: Performance Characteristics of All Linux RAIDs (mdadm/bonnie++)

On Wed, 28 May 2008 18:34:00 +0200
"Jens Bäckman" <jens.backman@...il.com> wrote:

> On Wed, May 28, 2008 at 10:53 AM, Justin Piszcz <jpiszcz@...idpixels.com> wrote:
> > Results:
> >
> > http://home.comcast.net/~jpiszcz/raid/20080528/raid-levels.html
> > http://home.comcast.net/~jpiszcz/raid/20080528/raid-levels.txt
> 
> Either the RAID 1 read speed must be wrong, or something is odd in the
> Linux implementation. There's six drives that can be used for reading
> at the same time, as they contain the very same data. 63MB/s
> sequential looks like what you would get from a single drive.

Which is fairly typical of a cheap desktop PC where the limitation is the
memory and PCI bridge as much as the drive.

Alan
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