I recently setup a 4 node Proxmox cluster and configured a logical volume and volume group on the 1st node. When I try to create the volume group on the 2nd node (after using pvcreate with the same device name /dev/sdb1) I get error "Physical volume '/dev/sdb1' is already in volume group 'vmdata'" I also noticed the logical volume I created in the 1st node shows up in all the other nodes even though those logical volumes don't exists on those 3 other servers.