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

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Message-ID: <483D8AE0.8090606@redhat.com>
Date:	Wed, 28 May 2008 12:40:00 -0400
From:	Chris Snook <csnook@...hat.com>
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++)

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 test is a single thread reading one block at a time, so this is not 
surprising.  If you get this doing multi-megabyte readahead, or with 
several threads, something is very wrong.

-- Chris
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