Date: Tue, 21 Oct 2003 20:08:53 -0400 From: Nathan Hawkins <utsl@quic.net> To: "Robert J. Adams (jason)" <radams@siscom.net> Cc: freebsd-fs@freebsd.org Subject: Re: >1 systems 1 FS Message-ID: <20031022000853.GA409@quic.net> In-Reply-To: <3F95C6F3.8030005@siscom.net> References: <3F95B946.8010309@newshosting.com> <20031021233414.GJ99943@elvis.mu.org> <3F95C6F3.8030005@siscom.net>
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On Tue, Oct 21, 2003 at 07:53:23PM -0400, Robert J. Adams (jason) wrote: > Alfred Perlstein wrote: > > >>Hello, > >> > >>I'm working on a new cluster design and had a quick question. If I have > >>a few boxes mounting the same FS (over a SAN) all read-only will it > >>work? Will I have any trouble? Has anyone tried this with UFS/UFS2 .. > > > > > >You shouldn't. > > I shouldn't do this or I shouldn't have trouble? :) No, you can get away with _all_ read only. It's the part where you mount RW somewhere that causes trouble. There is a little problem of cache coherency. > >>Lets take it one step further.. lets say I have 1 box that mounts it > >>RW.. and it updates the contents .. will the other systems that have it > >>mounted RO puke? > > > > > >Likely. > > Well shit.. I need this. There are some options: 1. Go to NAS, and use NFS. 2. Switch OS to one that has a cluster filesystem 3. Implement a filesystem with cluster support 4. Don't use a filesystem, use devices, and work around the problem in userspace
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