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Date: Wed, 17 Dec 2008 15:10:49 -0800
From: Andrew Sharp <andy.sharp@onstor.com>
To: Rich LaReau <richard.lareau@onstor.com>
Cc: Steffen Thuemmel <steffent@onstor.com>, dl-cstech <dl-cstech@onstor.com>
Subject: Re: RedHat 4 vs. 5
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Nice grab, Rich.

On Wed, 17 Dec 2008 14:29:35 -0800 Rich LaReau
<richard.lareau@onstor.com> wrote:

>=20
> This seems to be the source of the problems-- fixed for version 5.2.
>=20
> * a 50-75% drop in NFS server rewrite performance, compared to Red Hat
> Enterprise Linux 4.6, has been resolved.
>=20
> http://www.cyberciti.biz/tips/centos-rhel-poor-nfs-write-performance.html=
=20
>=20
> https://bugzilla.redhat.com/show_bug.cgi?id=3D448685
>=20
>=20
> -----Original Message-----
> From: Steffen Thuemmel=20
> Sent: Tuesday, December 16, 2008 11:53 PM
> To: Rich LaReau; dl-cstech
> Subject: RE: RedHat 4 vs. 5
>=20
> ...Bayer Crop Science in Belgium has such an issue. Thanks for
> forwarding this. Please keep me in the loop about what more you find
> out...
>=20
> Best Regards,=20
> =A0
> Steffen Thuemmel=20
> =A0
> ONStor GmbH
> =A0
> telf.=A0=A0=A0=A0=A0 +49 6196 400 102
> mobil. =A0=A0=A0 +49 173 673 3434
> mail.=A0=A0=A0=A0=A0=A0 steffen.thuemmel@onstor.com
>=20
> -----Original Message-----
> From: Rich LaReau
> Sent: Tuesday, December 16, 2008 1:53 AM
> To: dl-cstech
> Subject: RedHat 4 vs. 5
>=20
>=20
> I just found out from Shopzilla that they claim to have noticed
> significant performance differences between CentOS/Redhat versions,
> specifically a drop in performance when running "RedHat 5." He says
> that they learned there was a new "feature" in NFS at version 5,
> which requires read operations not to begin until corresponding
> writes are completed.  Presumably these could run concurrently in
> previous versions.
>=20
> I don't have any more information than that handy, but since we've
> had a few customers note similar issues I wanted to pass on what
> Shopzilla had to say about it.  I'll try to see if we can get some
> more specific details as well.
>=20
> Rich
