From: Emmanuel Florac <eflorac@intellique.com>
To: Milind Dumbare <milind@gslab.com>
Cc: xfs mailing list <xfs@oss.sgi.com>, linux-fsdevel@vger.kernel.org
Subject: Re: Multi threaded random IO
Date: Fri, 17 Jul 2009 13:10:43 +0200 [thread overview]
Message-ID: <20090717131043.19b8e7de@harpe.intellique.com> (raw)
In-Reply-To: <4A60442E.7010206@gslab.com>
Le Fri, 17 Jul 2009 02:28:14 -0700
Milind Dumbare <milind@gslab.com> écrivait:
> I see multi threaded random Write faster than multi threaded random
> Read. Which is contradictory to standard "Reads faster that Writes"
> law.
>
> My test setup is.
> 10MB record size, 2TB filesize, 8 threads.iozone
>
> Any comments?
Well it very much depends upon your underlying hardware. For instance
3Ware RAID cards with default settings read very poorly, they even get
much slower in sequential read than sequential write.
So basically you have to provide much more detailed hardware setup :
storage hardware, attachment, number and type of drives, RAID level...
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Emmanuel Florac | Intellique
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prev parent reply other threads:[~2009-07-17 11:10 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-17 9:28 Multi threaded random IO Milind Dumbare
2009-07-17 11:10 ` Emmanuel Florac [this message]
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