On Friday 22 January 2010 18:33:01 Dirk H. Schulz wrote: > Hi all, > > according to RedHat's docs creating snapshots in a cluster environment > should be basically possible. > > Here is what the "Cluster_Logical_Volume_Manager.pdf" says on page 49: > > LVM snapshots are not cluster-aware, so they require exclusive access > > to a volume. For information > > on activating logical volumes on individual nodes in a cluster, see > > Section 8, “Activating > > Logical Volumes on Individual Nodes in a Cluster”. [..] > So now I tried "lvcreate ... -s ..." on node 1 to create a snapshot, but > received the standard error that shapshots of clustered volumes are not > implemented yet. > > Now there is 2 possibilities how this could be understood: > 1. lvcreate refuses snapshotting cluster logical volumes if the cluster > bit is there - disregarding the exclusivity of the activation state. > 2. I did something wrong or incomplete. > > I really would regret number 1 being true, and because of the errors I > received inbetween I hope that 2 comes up as winner. :-) > E.g. on HPUX you have to activate the volume group exclusively, not the > logical volume. Could that be the reason. > > Is anyone out there who can shed enough light on all this? A word of warning : I am not an expert. Unfortunately the answer #1 seems to be the good one ... http://archives.free.net.ph/message/20081014.081254.df482534.en.html Latest thread on "linux-lvm" ML : https://www.redhat.com/archives/linux-lvm/2010-January/msg00007.html -- Xavier Montagutelli Tel : +33 (0)5 55 45 77 20 Service Commun Informatique Fax : +33 (0)5 55 45 75 95 Universite de Limoges 123, avenue Albert Thomas 87060 Limoges cedex -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
