On Wed, 2008-03-26 at 16:18 -0300, Davi Baldin wrote: > Hello All, > > > > I think to try using LVM2 in my clusters servers and have some questions > about it. Something I got on google, but something not: > > > > 1. Cluster-LVM is stable for production in Red Hat 5.1? Always run the latest errata, but yes. > 2. In my storage, when I create new LUN (two or more for performance) > and create the new VG with LUNs as PV, the new VG it's visible for each > node simultaneously? I can create three LV and mount one LV in one node, > and mount two LVs in other node for this VG? > 3. If I need quorum disk (for 3 nodes cluster), I can use a LV for the > quorum disk? (a) I'm not sure you'd need it in a 3-node case. 2/3 nodes crashing at the same time (b) It won't work very easily with clvm; you'd want to use shared raw SCSI devices. There's a circular dependency when using clvmd with qdiskd: * qdiskd requires clvmd * clvmd requires cluster quorum * cluster quorum requires qdiskd Historically, the solution has been one of two things: * don't use LVM for quorum partitions * If you must (which I doubt) use LVM for quorum partitions, you must then also have all nodes in the cluster online. At that point, you must manually start qdiskd. > 4. The LV mount occurs without any "know issue" in the node when the > other node dies? Clustered LVM protects the LVM metadata. After a node dies, you will not be able to mess with the LVM metadata on clustered VGs until fencing completes. > 5. The node shutdown dismount all LVs and the cluster can mount > perfectly de LVs in other node? Yes (as long as the remaining cluster has a quorum). > 6. I can use the pv, vg and lv operations like an unclustered LVM2 > system? Yes, after you set the locking type correctly in /etc/lvm/lvm.conf -- Lon -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
