From: "Talpey, Thomas" Subject: Re: Performance: NFS v3 mounting with 'noac' option Date: Thu, 08 Mar 2007 11:19:46 -0500 Message-ID: References: <121929.1837.qm@web56610.mail.re3.yahoo.com> <45F03624.1000207@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Cc: nfs@lists.sourceforge.net To: AK , Peter Staubach Return-path: Received: from sc8-sf-mx2-b.sourceforge.net ([10.3.1.92] helo=mail.sourceforge.net) by sc8-sf-list2-new.sourceforge.net with esmtp (Exim 4.43) id 1HPLLa-0004Kf-TP for nfs@lists.sourceforge.net; Thu, 08 Mar 2007 08:20:07 -0800 Received: from mx2.netapp.com ([216.240.18.37]) by mail.sourceforge.net with esmtp (Exim 4.44) id 1HPLLb-0003nR-QZ for nfs@lists.sourceforge.net; Thu, 08 Mar 2007 08:20:09 -0800 In-Reply-To: <45F03624.1000207@redhat.com> References: <121929.1837.qm@web56610.mail.re3.yahoo.com> <45F03624.1000207@redhat.com> List-Id: "Discussion of NFS under Linux development, interoperability, and testing." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: nfs-bounces@lists.sourceforge.net Errors-To: nfs-bounces@lists.sourceforge.net At 11:13 AM 3/8/2007, Peter Staubach wrote: >AK wrote: >> "To use ROMIO on NFS, file locking with fcntl must >> work correctly on the NFS installation. On some >> installations, fcntl locks don't work. To get them to >> work, you need to use Version 3 of NFS, ensure that >> the lockd daemon is running on all the machines, and >> have the system administrator mount the NFS file >> system with the "noac" option (no attribute caching). >> Turning off attribute caching may reduce performance, >> but it is necessary for correct behavior." > >I think that I would assume that fcntl style locking works on all current >implementations, that this is not NFS version dependent, and also that >"noac" is not required in combination with the locking in order to get >correct behavior. Ouch - I agree with Peter, this advice is way, way out of date. >"The following are some instructions we received from Ian Wells of HP >for setting the noac option on NFS. We have not tried them >ourselves. We are including them here because you may find >them useful. Note that some of the steps may be specific to HP >systems, and ..." Leave noac alone, the Linux client will do the right thing with its cache when locking is available. Tom. ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs