From owner-freebsd-questions@FreeBSD.ORG  Fri Aug 29 21:20:31 2008
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id B4FDB1065672
	for <freebsd-questions@freebsd.org>;
	Fri, 29 Aug 2008 21:20:31 +0000 (UTC)
	(envelope-from derek@csolve.net)
Received: from balrog.csolve.net (balrog.csolve.net [207.164.80.179])
	by mx1.freebsd.org (Postfix) with ESMTP id 94E068FC1F
	for <freebsd-questions@freebsd.org>;
	Fri, 29 Aug 2008 21:20:31 +0000 (UTC)
	(envelope-from derek@csolve.net)
Received: from alpha.csolve.net ([10.10.18.126])
	by balrog.csolve.net with esmtpa (Exim 4.69 (FreeBSD))
	(envelope-from <derek@csolve.net>) id 1KZAvj-000AyT-B5
	for freebsd-questions@freebsd.org; Fri, 29 Aug 2008 16:50:51 -0400
Message-Id: <3099DB76-6B35-46D7-8875-DC1CA462C71D@csolve.net>
From: Derek Buttineau <derek@csolve.net>
To: freebsd-questions@freebsd.org
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
Content-Transfer-Encoding: 7bit
Mime-Version: 1.0 (Apple Message framework v928.1)
Date: Fri, 29 Aug 2008 16:50:51 -0400
X-Mailer: Apple Mail (2.928.1)
X-Authenticated-Id: test
Subject: NFS and File Over Write Performance
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 29 Aug 2008 21:20:31 -0000

Just curious if anyone has run into this before.  We are testing an HP  
DL380 G5 Storage Server.  The odd thing I'm experiencing is when over  
writing a file on the NFS share with the FreeBSD NFS client my  
transfer speed is about 1/3 of what it is if I'm creating a new file  
on the share.  This is all over a 1Gb link and I'm using clpbar to  
monitor speeds on the copy.

 From my tests, initial file creation gets me about 89MB/s, while  
overwriting gets me about 25MB/s

The same test using RHEL4 as the client gives a consistent 79MB/s for  
creation and overwrite.

Seems very strange and I've tested from FreeBSD 6.2, 6.3 and 7.0, all  
with the same results.

Any thoughts?

Thanks,

Derek