From: Greg Banks Subject: Re: Strange delays on NFS server Date: Wed, 25 Aug 2004 20:02:27 +1000 Sender: nfs-admin@lists.sourceforge.net Message-ID: <20040825100227.GB16483@sgi.com> References: <411CD601.1080308@RedHat.com> <4120AB46.1080606@stams.strath.ac.uk> <20040816131434.GL3510@suse.de> <4120C8D5.3040606@stams.strath.ac.uk> <20040816145435.GQ3510@suse.de> <4124CD95.7020007@stams.strath.ac.uk> <20040820095854.GC23176@suse.de> <412B0EDE.5010206@stams.strath.ac.uk> <20040825020241.GB16037@sgi.com> <412C5084.9050605@stams.strath.ac.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: nfs@lists.sourceforge.net Return-path: Received: from sc8-sf-mx2-b.sourceforge.net ([10.3.1.12] helo=sc8-sf-mx2.sourceforge.net) by sc8-sf-list2.sourceforge.net with esmtp (Exim 4.30) id 1Bzubz-0005MD-Ek for nfs@lists.sourceforge.net; Wed, 25 Aug 2004 03:02:35 -0700 Received: from omx2-ext.sgi.com ([192.48.171.19] helo=omx2.sgi.com) by sc8-sf-mx2.sourceforge.net with esmtp (Exim 4.34) id 1Bzubx-0000d7-GF for nfs@lists.sourceforge.net; Wed, 25 Aug 2004 03:02:33 -0700 To: Ian Thurlbeck In-Reply-To: <412C5084.9050605@stams.strath.ac.uk> Errors-To: nfs-admin@lists.sourceforge.net List-Unsubscribe: , List-Id: Discussion of NFS under Linux development, interoperability, and testing. List-Post: List-Help: List-Subscribe: , List-Archive: On Wed, Aug 25, 2004 at 09:40:36AM +0100, Ian Thurlbeck wrote: > Server stats since reboot Monday morning. It is lightly > loaded mostly: > > Server nfs v3: > null getattr setattr lookup access readlink > 85912 2% 1626277 46% 12375 0% 135833 3% 1295417 36% 773 0% > read write create mkdir symlink mknod > 136099 3% 151569 4% 7899 0% 64 0% 194 0% 0 0% > remove rmdir rename link readdir readdirplus > 6270 0% 37 0% 2931 0% 969 0% 266 0% 4893 0% > fsstat fsinfo pathconf commit > 1508 0% 890 0% 0 0% 41205 1% Yes, it is lightly loaded. You said your block size is 8K, so the server has seen about 1.18 GB of writes in 3 days, which is just over twice RAM size. How many of these slowdown events did you see in that time? Can you run "vmstat 1" and log the result please? You said you have a 3ware RAID controller. What is RAID configuration, especially RAID level and stripe width? What options did you use to build the ext3 filesystem? > So that's about 4 writes for every commit. Ok, so your clients are doing enough COMMITs. > File system export: > > /export/raid50 @unix(rw,sync,no_wdelay,hide,nocrossmnt,secure,root_squash, > no_all_squash,subtree_check,secure_locks,mapping=identity, > anonuid=-2,anongid=-2) Hmm, no "async". So much for that idea. Greg. -- Greg Banks, R&D Software Engineer, SGI Australian Software Group. I don't speak for SGI. ------------------------------------------------------- SF.Net email is sponsored by Shop4tech.com-Lowest price on Blank Media 100pk Sonic DVD-R 4x for only $29 -100pk Sonic DVD+R for only $33 Save 50% off Retail on Ink & Toner - Free Shipping and Free Gift. http://www.shop4tech.com/z/Inkjet_Cartridges/9_108_r285 _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs