From: "myciel" Subject: Re: nfs performance problem Date: Wed, 6 Nov 2002 09:59:01 +0100 Sender: nfs-admin@lists.sourceforge.net Message-ID: <003201c28572$c04ea260$640a010a@winda> References: <005b01c284f5$ae1d6090$640a010a@winda> <20021105201758.I23227@vestdata.no> <007901c28505$51e9c240$640a010a@winda> <20021106003237.L23227@vestdata.no> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Return-path: Received: from rtr.pul.pl ([195.116.89.98] helo=poczta.dotcom.pl) by usw-sf-list1.sourceforge.net with esmtp (Exim 3.31-VA-mm2 #1 (Debian)) id 189M71-0001Rg-00 for ; Wed, 06 Nov 2002 01:04:36 -0800 Received: from winda (office.interia.pl [213.76.176.114]) by poczta.dotcom.pl (Postfix) with ESMTP id B882C16E16 for ; Wed, 6 Nov 2002 10:02:00 +0100 (CET) To: 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: ----- Original Message ----- From: "Ragnar Kj=F8rstad" To: "poczta.dotcom.pl" Cc: Sent: Wednesday, November 06, 2002 12:32 AM Subject: Re: [NFS] nfs performance problem > On Tue, Nov 05, 2002 at 08:55:41PM +0100, poczta.dotcom.pl wrote: > > > How is local performance? > > > > local read/writes are ok > > > > > What filesystem do you use? > > > > reiserfs on top of lvm (to be able to get snapshots) > > What reiserfs-version? 3.5 or 3.6? > What on-disk format? 3.5 or 3.6? 3.6.25 > > > > 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? now I have 4.0.6, iostat -x -k 60 3 - outputs only column titles every 60 seconds but lin= e where numbers should be is blank, the same I have on other machine (fresh gentoo linux) > 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. anyway local writes are ok > > 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 > poor performance on RAID5 - especially for writes. reiserfs 3.6.25, raid 5, ok, I can understand raid 5 is not fast but getting below 2Mbytes/s is really poor :-( > > If that's correct, then switching to a different RAID-level or replacin= g > 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. > what kind of IDE-RAID would You suggest? thanks rafal mycielski ------------------------------------------------------- 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