From: "H. Peter Anvin" <hpa@zytor.com>
To: Peter Rabbitson <rabbit+list@rabbit.us>
Cc: linux-raid@vger.kernel.org
Subject: Re: Raid6 write performance
Date: Fri, 27 Feb 2009 17:04:52 -0800 [thread overview]
Message-ID: <49A88DB4.40008@zytor.com> (raw)
In-Reply-To: <49742E74.9090502@rabbit.us>
Peter Rabbitson wrote:
> Hi,
>
> I am experimenting with raid6 on 4 drives on 2.6.27.11. The problem I am
> having is that no matter what chunk size I use, the write benchmark
> always comes out at single drive speed, although I should be seeing
> double drive speed (read speed is at near 4x as expected).
I have no idea why you "should" be seeing double drive speed. All
drives have to be written, so you'd logically see single drive speed.
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
next prev parent reply other threads:[~2009-02-28 1:04 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-19 7:40 Raid6 write performance Peter Rabbitson
2009-01-19 8:10 ` thomas62186218
2009-01-19 9:07 ` NiftyFedora Mitch
2009-01-26 18:47 ` Bill Davidsen
2009-01-19 12:48 ` Keld Jørn Simonsen
2009-01-19 12:50 ` Peter Rabbitson
2009-01-19 10:37 ` Peter Rabbitson
2009-01-19 10:58 ` Bernd Schubert
2009-01-19 11:01 ` Peter Rabbitson
2009-01-19 11:08 ` Bernd Schubert
2009-02-28 1:04 ` H. Peter Anvin [this message]
2009-03-01 19:12 ` Michał Przyłuski
2009-03-01 20:35 ` H. Peter Anvin
2009-03-01 19:19 ` Peter Rabbitson
2009-03-13 17:11 ` Bill Davidsen
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