On Feb 10, 2012, at 11:46 PM, Manish Kathuria wrote: > On a two node (active-passive) cluster with external storage on RHEL > 6.1, we need to use Snapshots for taking backup of the logical volumes > on the storage. As per the documentation, snapshots are not supported > on clustered logical volumes (using CLVM). Since each of the logical > volumes on the external storage are going to be exclusively mounted > (and used) by a single node at any point of time, we can therefore use > HA-LVM instead of CLVM. However, for configuring HA-LVM also, there > are two suggested methods > (https://access.redhat.com/kb/docs/DOC-3068): > > - first one is the simpler one, using the CLVM variant while the other > one is the original method using volume_list and VG tags. > > I have a few queries related to both. > > Do snapshots work if we configure HA-LVM using CLVM and run the clvmd daemon ? Yes (recently). Whether you are using HA-LVM or CLVM, if the logical volume is exclusive, you can snapshot it. > In case of the original HA-LVM configuration method, can we leave the > volume_list in /etc/lvm/lvm.conf blank since we are not going to have > any shared VGs or LVs except for those which are going to be shared > using HA-LVM. You can't leave the volume_list blank. Doing so would mean that your computer could not find your local drives the next time it boots up - forcing you to boot into an old kernel to bring the machine up. You must at least put the local VGs in the volume list. brassow -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
