From: =?iso-8859-1?Q?Ragnar_Kj=F8rstad?= Subject: Re: nfs performance problem Date: Thu, 7 Nov 2002 18:32:06 +0100 Sender: nfs-admin@lists.sourceforge.net Message-ID: <20021107183206.P23227@vestdata.no> References: 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 189qVx-0004qv-00 for ; Thu, 07 Nov 2002 09:32:22 -0800 To: "Baker, Byran" In-Reply-To: ; from Byran_Baker@bmc.com on Thu, Nov 07, 2002 at 09:19:44AM -0600 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 Thu, Nov 07, 2002 at 09:19:44AM -0600, Baker, Byran wrote: > We have a couple of NFS servers with 3ware cards. One is a 3ware 7850 = (8 > Maxtor 160GB - 5400RPM) and one is a 3ware 7500-12, both configured wit= h > RAID 5 + Hot Spare. I have all the latest NFS patches applied. If I a= ccess > an NFS mounted directory on one of these systems and copy a bunch of li= ttle > files (1-2KB), I get 150-250 tps. If I access larger files (90% > 1MB = each) > I will normally see 25-60MB/s transfer with 500-700 tps, with peaks of = over > 1000 tps - A good indication that disk seek is to blame for the problem= with > the small files. Just to clarify here. I bet when you transfer 1-2KB files you are able to transfer 150-250 files pr second, right?=20 When you transfer larger files the files pr second rate goes down, but the tps-rate increases because each file is split into multiple scsi requests.=20 And yes, I would agree with your conclution that disk seek is to blame. Are those numbers for reads or writes? I would expect to see the same tendency, but with stronger effect, for writes than reads. --=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