From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Staubach Subject: Re: Re: NFS synchronization problems on Beowulf cluster Date: Thu, 01 Jun 2006 10:25:14 -0400 Message-ID: <447EF8CA.3020200@redhat.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Cc: nfs@lists.sourceforge.net Return-path: Received: from [10.3.1.94] (helo=sc8-sf-list2-new.sourceforge.net) by sc8-sf-list2.sourceforge.net with esmtp (Exim 4.30) id 1Flo84-0003Qg-Ek for nfs@lists.sourceforge.net; Thu, 01 Jun 2006 07:26:28 -0700 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 1Flo83-0003n0-VZ for nfs@lists.sourceforge.net; Thu, 01 Jun 2006 07:26:28 -0700 Received: from mx1.redhat.com ([66.187.233.31]) by mail.sourceforge.net with esmtp (Exim 4.44) id 1Flo81-0004FJ-Vb for nfs@lists.sourceforge.net; Thu, 01 Jun 2006 07:26:27 -0700 To: Mario Storti In-Reply-To: Sender: nfs-admin@lists.sourceforge.net 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: Mario Storti wrote: >Mario Storti intec.unl.edu.ar> writes: > > > >>We have a Beowulf class cluster built on Linux Fedora Core 3 (kernel >>2.6.15). The cluster is disk-less (nodes don't have hard disks) based >>on the Warewulf package. NFS traffic is reduced by using VNFS >>filesystems at the nodes. >> >>We found something strange related with NFS. For some files in user >>accounts if we make some modifications to the file in the server, this >>changes are not seen in the compute nodes. The NFS server is NFS3 and >>with the standard configuration (8 instances of the server and default >>parameters). The cluster has 20 nodes at this time, but we have made >>experiments with a `cloned' cluster and even with only two nodes the >>problem persist. >> >> > >I see now that perhaps my reference to VNFS is somewhat obscure. VNFS >is basically a RAM disk at the nodes (in our case of size 50MB >approx.) with typically `light' directories /etc, /bin, /lib... > >http://www.warewulf-cluster.org/cgi-bin/trac.cgi/wiki/VNFS > >The `heavy' directories like /usr and /home are exported via standard >NFS, so that the VNFS issue is not directly related with the problem. > >On the other hand we tried to switch to NFS version 2 and the problem >persists. > What is the local file system type being exported on the NFS servers? Thanx... ps ------------------------------------------------------- All the advantages of Linux Managed Hosting--Without the Cost and Risk! Fully trained technicians. The highest number of Red Hat certifications in the hosting industry. Fanatical Support. Click to learn more http://sel.as-us.falkag.net/sel?cmd=lnk&kid=107521&bid=248729&dat=121642 _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs