Troy, What is the model/vendor of the switch? What are the models/vendors of the servers? I ran into a similar problem in our lab (no network power switches) and there are a few ways to get around that problem. Thanks, jacob > -----Original Message----- > From: linux-cluster-bounces@xxxxxxxxxx > [mailto:linux-cluster-bounces@xxxxxxxxxx] On Behalf Of Troy Dawson > Sent: Thursday, June 23, 2005 8:43 AM > To: linux clustering > Subject: Simplest 4 node GFS 6.1 cluster > > Hello, > I've really been trying to figure this out from the > documentation, and if it's in there, please point me at it. > > Here is what I want to do. I have 4 machines, all connected > to the same SAN disk. 1 machine will be the only machine > that can read and write to the disk. The other 3 will be > read only. The read only machines will be the only ones that > have outside services running, such as ftp, nfs, rsync. > > I don't have a reliable 5th machine. So I don't have a way > to do an external lock manager. > > I don't want any failover, but I also don't want a single > point of failure. Basically if one of the read only machines > goes dead, then it's dead, nothing takes it's place, but the > other machines can go right on working. If the read, write > machine goes dead, then it's dead, but the read only machines > can go right on doing what they normally do. And if two or > three machines die, I still want the one to still be able to > at least read the data. > > This idea of fencing is what's throwing me off. If I'm > reading things right, I can't do group GFS without them being > in a cluster, and they can't be in a cluster without doing > fencing. But the fencing seems to just allow the various > machines to take over for one another. > > I also don't have access to the SAN switch, other than my > machines plug into it. It's essentially a black box. These > machines also don't have any way to remotely turn power on an off. > > Is GFS what I really want? I've tried just standard ext3, > but I was getting a caching problem with my read only > machines. Do I just want to try and fix my caching problem? > > Troy Dawson > -- > __________________________________________________ > Troy Dawson dawson@xxxxxxxx (630)840-6468 Fermilab > ComputingDivision/CSS CSI Group > __________________________________________________ > > -- > > Linux-cluster@xxxxxxxxxx > http://www.redhat.com/mailman/listinfo/linux-cluster > -- Linux-cluster@xxxxxxxxxx http://www.redhat.com/mailman/listinfo/linux-cluster
