Nikolas Lam napisał(a): > On Mon, 2007-10-22 at 16:39 +0300, Mikko Partio wrote: >> Hello list >> >> does RHEL 5 support cmirror (creating lvm mirrored volumes in a >> cluster environment)? I can't find any rpm packages for it. My goal is >> to increase redundancy by mirroring data between two sans. >> >> Regards >> >> M > > Hi Mikko, > > Unfortunately the answer is no at the moment. This and LVM snapshots are > two things that I know can't be done with RHEL5's CLVM yet. I've been > told by Red Hat consultants that update 2 is the current target for > these features. > > We wanted to use this solution to automate SAN failover between two HP > EVAs in different data centres but in the end have ended up having to > use HP's Continuous Access system to handle mirroring behind the scenes. > Fortunately we were already needed this mirroring elsewhere in the > university because I'm told the license costs six figures, which is a > lot more expensive than host based mirroring (0 dollars ;). > > In some ways this is better because it removes a potential split brain > scenario that could happen if host-based mirroring was used. But it does > require manual intervention by a SAN administrator in the event of EVA > failure, which is not going to happen quickly if it happens, say at 3am. You can use LVM on the top of DRBD [1]. It is very simple to implement with bash scripts(manual failover) or with Heartbeat(automatic failover) [2]. In my opinion DRBD is better solution than cmirror, because you don't need third device. [1] - http://www.drbd.org/ [2] - http://www.linux-ha.org/ Best Regards Maciej Bogucki -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
