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

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Message-ID: <alpine.DEB.1.10.0805281333080.29755@p34.internal.lan>
Date:	Wed, 28 May 2008 13:33:46 -0400 (EDT)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	Jens Bäckman <jens.backman@...il.com>
cc:	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, Jens Bäckman 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.
>

The RAID1 is correct.  As has been discussed on this list before, you will 
only see raid speed > 1 disk if you run 2(?, or 3 minimal) threads 
from the same device (raid1).

Justin.