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

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Message-ID: <20080528164616.GB29722@atlantis.cc.ndsu.NoDak.edu>
Date:	Wed, 28 May 2008 11:46:16 -0500
From:	Bryan Mesich <bryan.mesich@...u.edu>
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, May 28, 2008 at 06:34:00PM +0200, Jens Bäckman wrote:

> 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 RAID 1 read speed metrics do not depict multithreaded
processes reading from the array simutaneouly. I would suspect
that the read performance metrics would look better if 2 bonnie
simulations were ran together (for RAID 1 that is).

Bryan 
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