From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: "Jens Bäckman" <jens.backman@gmail.com>
Cc: Justin Piszcz <jpiszcz@lucidpixels.com>,
linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org,
xfs@oss.sgi.com
Subject: Re: Performance Characteristics of All Linux RAIDs (mdadm/bonnie++)
Date: Wed, 28 May 2008 19:57:52 +0100 [thread overview]
Message-ID: <20080528195752.0cdcbc6d@core> (raw)
In-Reply-To: <95711f160805280934y77ed7d91tec5aeb531bf8013c@mail.gmail.com>
On Wed, 28 May 2008 18:34:00 +0200
"Jens Bäckman" <jens.backman@gmail.com> wrote:
> On Wed, May 28, 2008 at 10:53 AM, Justin Piszcz <jpiszcz@lucidpixels.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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next prev parent reply other threads:[~2008-05-28 18:57 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-28 8:53 Performance Characteristics of All Linux RAIDs (mdadm/bonnie++) Justin Piszcz
2008-05-28 10:54 ` Peter Rabbitson
2008-05-28 11:05 ` Justin Piszcz
2008-05-28 15:40 ` Chris Snook
2008-05-28 17:32 ` Justin Piszcz
2008-05-28 17:53 ` Justin Piszcz
2008-05-28 19:22 ` Chris Snook
2008-05-28 19:27 ` Justin Piszcz
2008-05-29 9:57 ` Kasper Sandberg
2008-05-29 21:08 ` Justin Piszcz
2008-05-28 20:03 ` Richard Scobie
2008-05-28 20:01 ` Justin Piszcz
2008-05-28 16:34 ` Jens Bäckman
2008-05-28 16:40 ` Chris Snook
2008-05-28 16:46 ` Bryan Mesich
2008-05-28 17:33 ` Justin Piszcz
2008-05-28 18:57 ` Alan Cox [this message]
2008-05-28 23:00 ` Bill Davidsen
2008-05-29 11:22 ` Alan Cox
2008-05-30 12:22 ` Bill Davidsen
2008-05-28 19:02 ` Keld Jørn Simonsen
2008-05-28 19:05 ` Justin Piszcz
2008-05-28 23:09 ` Bill Davidsen
2008-05-29 6:37 ` Michal Soltys
2008-05-29 6:44 ` Holger Kiehl
2008-05-29 12:06 ` Justin Piszcz
2008-05-29 17:02 ` Justin Piszcz
2008-05-30 12:55 ` Bill Davidsen
2008-05-30 14:23 ` Keld Jørn Simonsen
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