From: =?iso-8859-1?Q?Ragnar_Kj=F8rstad?= Subject: Re: nfs performance problem Date: Wed, 6 Nov 2002 00:32:37 +0100 Sender: nfs-admin@lists.sourceforge.net Message-ID: <20021106003237.L23227@vestdata.no> References: <005b01c284f5$ae1d6090$640a010a@winda> <20021105201758.I23227@vestdata.no> <007901c28505$51e9c240$640a010a@winda> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Cc: nfs@lists.sourceforge.net Return-path: Received: from stine.vestdata.no ([195.204.68.10]) by usw-sf-list1.sourceforge.net with esmtp (Exim 3.31-VA-mm2 #1 (Debian)) id 189DBe-0008Fx-00 for ; Tue, 05 Nov 2002 15:32:46 -0800 To: "poczta.dotcom.pl" In-Reply-To: <007901c28505$51e9c240$640a010a@winda>; from myciel@dotcom.pl on Tue, Nov 05, 2002 at 08:55:41PM +0100 Errors-To: nfs-admin@lists.sourceforge.net List-Help: List-Post: List-Subscribe: , List-Id: Discussion of NFS under Linux development, interoperability, and testing. List-Unsubscribe: , List-Archive: On Tue, Nov 05, 2002 at 08:55:41PM +0100, poczta.dotcom.pl wrote: > > How is local performance? >=20 > local read/writes are ok >=20 > > What filesystem do you use? >=20 > reiserfs on top of lvm (to be able to get snapshots) What reiserfs-version? 3.5 or 3.6?=20 What on-disk format? 3.5 or 3.6? There should be an entry in the kernel-log from when the filesystem is mounted.=20 Reiserfs-3.5 has some known performance-problems related to NFS - that may be your problem. > > What's the output from "iostat -x -d -k 60 3"? > > > below is output from 'iostat -d 60 3' (- my iostat does not take '-k' > option, > and '-d' gives me empty output) - mayby this is enough? And not -x either? iostat fr=E5 sysstat-4.0.3-2 (from RedHat) includes a "-x" option for extended output. Most importantly, it will tell how much of the time each device is busy. It's unclear from your posts if this is a io-related problem or not. Unnless you're running reiserfs-3.5 my guess is that it is the IO-performance that is the problem. 3ware 7500 controllers have rather=20 poor performance on RAID5 - especially for writes.=20 If that's correct, then switching to a different RAID-level or replacing the 3ware-controller should solve the problem. SCSI- or FC- RAIDS are easily 10 or 20 times faster than the 3ware RAID for some types of operations, and if you want something cheaper there is also different types of IDE-RAIDs. --=20 Ragnar Kj=F8rstad Big Storage ------------------------------------------------------- This sf.net email is sponsored by: See the NEW Palm Tungsten T handheld. Power & Color in a compact size! http://ads.sourceforge.net/cgi-bin/redirect.pl?palm0001en _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs