From owner-freebsd-net@FreeBSD.ORG Tue Aug 15 18:21:01 2006 Return-Path: X-Original-To: freebsd-net@FreeBSD.ORG Delivered-To: freebsd-net@FreeBSD.ORG Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 09B4116A4E1 for ; Tue, 15 Aug 2006 18:21:01 +0000 (UTC) (envelope-from cswiger@mac.com) Received: from smtpout.mac.com (smtpout.mac.com [17.250.248.173]) by mx1.FreeBSD.org (Postfix) with ESMTP id 23E2343D73 for ; Tue, 15 Aug 2006 18:20:53 +0000 (GMT) (envelope-from cswiger@mac.com) Received: from mac.com (smtpin07-en2 [10.13.10.152]) by smtpout.mac.com (Xserve/8.12.11/smtpout03/MantshX 4.0) with ESMTP id k7FIKpiO013057; Tue, 15 Aug 2006 11:20:51 -0700 (PDT) Received: from [17.214.14.142] (a17-214-14-142.apple.com [17.214.14.142]) (authenticated bits=0) by mac.com (Xserve/smtpin07/MantshX 4.0) with ESMTP id k7FIKmUs002794; Tue, 15 Aug 2006 11:20:50 -0700 (PDT) In-Reply-To: <20060815123032.GR8503@catpipe.net> References: <200608141555.k7EFthXw092647@lurza.secnetix.de> <44E0C450.8050602@fsn.hu> <20060815122533.GB89848@uk.tiscali.com> <20060815123032.GR8503@catpipe.net> Mime-Version: 1.0 (Apple Message framework v752.2) Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Message-Id: <6FAF95DA-76D5-4D72-A3C5-88AEA6F13267@mac.com> Content-Transfer-Encoding: 7bit From: Chuck Swiger Date: Tue, 15 Aug 2006 11:20:47 -0700 To: Phil Regnauld X-Mailer: Apple Mail (2.752.2) Cc: freebsd-net@FreeBSD.ORG, Brian Candler Subject: Re: Redundant/failover NFS servers - stale NFS file handle X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 15 Aug 2006 18:21:01 -0000 On Aug 15, 2006, at 5:30 AM, Phil Regnauld wrote: > Brian Candler (B.Candler) writes: >> So to make an update, you would have to unmount from box 2, >> remount RW on >> box 1, make the change, remount RO on box 1, and mount RO again on >> box 2. > > To make it short: if you want a reliable NFS head, you need NetApp. > If you want to make failover, you'll need something like WAFL that > has virtual inodes and allows for concurrent access from multiple > writers. This is more of a freebsd-fs discussion. I think Solaris also makes a reliable NFS platform, and it even supports failover and replication for read-only mounts. For read/ write replicated filesystems, you're probably looking at AFS (Andrew File System, but an opensource version is at www.openafs.org from IBM, who apparently bought out Transarc) or maybe Coda. -- -Chuck