From mboxrd@z Thu Jan 1 00:00:00 1970 From: Trond Myklebust Subject: Re: NFS synchronization problems on Beowulf cluster Date: Tue, 18 Jul 2006 09:48:51 -0400 Message-ID: <1153230531.22180.7.camel@localhost> References: <1153162159.13961.3.camel@localhost> 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 ([10.3.1.92] helo=mail.sourceforge.net) by sc8-sf-list2-new.sourceforge.net with esmtp (Exim 4.43) id 1G2pwr-0006QE-FB for nfs@lists.sourceforge.net; Tue, 18 Jul 2006 06:49:17 -0700 Received: from pat.uio.no ([129.240.10.4] ident=7411) by mail.sourceforge.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.44) id 1G2pwr-00072A-Cg for nfs@lists.sourceforge.net; Tue, 18 Jul 2006 06:49:17 -0700 To: Mario Storti In-Reply-To: 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 On Tue, 2006-07-18 at 08:19 -0300, Mario Storti wrote: > > This is a FAQ that has been well-publicised and discussed to death on > > this list: > > http://nfs.sourceforge.net/#faq_a8 > > I tried to mount with `nocto' and `noac' options without success. Also > tried acregmax=0,acdirmax=0. We are trying to determine if there is > some mistake in our configuration or if this is a `normal' > behavior. Your post seems to suggest that this is a `normal' behavior. > However, previously we had a cluster with RedHat 7.1 (kernel > 2.2.16-22, NFS version 2) and we didn't had problems like this. We > tried to use NFS version 2 on the new cluster and the problem > persists. So I think that this is problem with the configuration and we > are still trying to solve the problem tuning the mount/server options. Please reread the article. This is _normal_ behaviour. NFS has never been guaranteed to be cache coherent in this way. NFS checks its data cache on calls to open()/opendir(), and on taking a lock. That is all. Cheers, Trond ------------------------------------------------------------------------- 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