From: Neil Brown Subject: Re: Re: NFS as a Cluster File System. Date: Tue, 14 Jan 2003 07:40:38 +1100 Sender: nfs-admin@lists.sourceforge.net Message-ID: <15907.9286.737016.365337@notabene.cse.unsw.edu.au> References: <3E1DE9D6.7040406@unix.sh> <15907.5456.68906.820989@notabene.cse.unsw.edu.au> <1042489523.2807.291.camel@localhost> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Alan Robertson , Lorn Kay , NFS mailing list , linux-ha@muc.de Return-path: Received: from tone.orchestra.cse.unsw.edu.au ([129.94.242.28] ident=root) by sc8-sf-list1.sourceforge.net with smtp (Exim 3.31-VA-mm2 #1 (Debian)) id 18YBOb-0005vW-00 for ; Mon, 13 Jan 2003 12:41:21 -0800 Received: From notabene.cse.unsw.edu.au ([129.94.242.45] == bartok.orchestra.cse.unsw.EDU.AU) (for ) (for ) (for ) (for ) (for ) By tone With Smtp ; Tue, 14 Jan 2003 07:40:52 +1100 To: "David B. Ritch" In-Reply-To: message from David B. Ritch on January 13 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: On January 13, dritch@hpti.com wrote: > I agree that cache coherency is not a sensible goal for a cluster > filesystem. However, cache coherency of metadata is rather important. > For example, when one node creates a file of intermediate data, it is > important for the other nodes to be able to see that. Using actime=0 is > the conventional mechanism for allowing file creation and deletion to be > propagated quickly. Usually, one can tweak that a bit to reduce the > burden on the server. However, it might be be nice if there were a > mechanism to propagate this sort of metadata change without dumping all > metadata over a second or two old. If the 'other nodes' open the file and look in it, then they should see current data (if they don't it's a bug). If they just 'stat' it to see if it has changed then they may see and old timestamp. I recommend openning the file. It is an explicit way for the application to say "I really want to know the current state of this file". NeilBrown ------------------------------------------------------- This SF.NET email is sponsored by: FREE SSL Guide from Thawte are you planning your Web Server Security? Click here to get a FREE Thawte SSL guide and find the answers to all your SSL security issues. http://ads.sourceforge.net/cgi-bin/redirect.pl?thaw0026en _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs