From: "Baker, Byran" Subject: Re: nfs performance problem Date: Thu, 7 Nov 2002 09:19:44 -0600 Sender: nfs-admin@lists.sourceforge.net Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Return-path: Received: from camaro.bmc.com ([198.207.223.231] helo=creeper.bmc.com) by usw-sf-list1.sourceforge.net with esmtp (Exim 3.31-VA-mm2 #1 (Debian)) id 189oS5-0006Du-00 for ; Thu, 07 Nov 2002 07:20:14 -0800 Received: from ec02-hou.bmc.com (localhost [127.0.0.1]) by creeper.bmc.com (8.10.2/8.10.2) with ESMTP id gA7FJkf26852 for ; Thu, 7 Nov 2002 09:19:46 -0600 (CST) To: "'nfs@lists.sourceforge.net'" 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: 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 with RAID 5 + Hot Spare. I have all the latest NFS patches applied. If I access an NFS mounted directory on one of these systems and copy a bunch of little 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. Thanks, -Byran From: "Matt Heaton" To: "poczta.dotcom.pl" , Subject: Re: [NFS] nfs performance problem Date: Tue, 5 Nov 2002 13:22:25 -0700 I have 3ware cards as well (2 7500 Series 8 drive), just like yours. ALso with 120 GIG drives (7200) RPM. Whever I get 150-200 tps in iostat then my NFS runs SO SLOW. I also only get 1 MB, to 1.5 MB over NFS. The local speed seems to be ok, not great though. MY OPINION is that this is because of seek time on the raid array. I am serving very small files, just like you are. I am requesting about 200-300 files per second from each NFS server. So even though our throughput of only 1.5 MB isn't high. The number of files per second is actually quite high, and causes things to slow down because of seek time issues. PLEASE GIVE US CACHEFS SOMEONE?? Does anyone have experience with IDE Raid arrays that get over 250 tps in iostat that work fine? I would be VERY VERY VERY interested to find out. L8r... Matt ------------------------------------------------------- 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