Hi all, I'm trying to use the snapshot feature in a cluster environment but I keep getting this error: # lvcreate --size 100M --snapshot --name snap /dev/vg00/lvol1 Clustered snapshots are not yet supported. Reading the documentation: http://www.redhat.com/docs/manuals/enterprise/RHEL-5-manual/Cluster_Logical_Volume_Manager/snapshot_command.html "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 4.8, Activating Logical Volumes on Individual Nodes in a Cluster." "To activate logical volumes exclusively on one node, use the lvchange -aey command." I followed the instructions above but I get the same result: # lvchange -aey /dev/vg00/lvol1 # lvcreate --size 100M --snapshot --name snap /dev/vg00/lvol1 Clustered snapshots are not yet supported. Looking at the LVM2 code (LVM2.2.02.40, tools/lvcreate.c:640): /* FIXME Allow exclusive activation. */ if (vg_is_clustered(vg)) { log_error("Clustered snapshots are not yet supported."); return 0; } looks like there is no way to activate a snapshot in a clustered volume group. Is the documentation wrong? Is there anyone actively working on the "exclusive activation" FIXME that is mentioned in the comment? As a matter of fact I've been able to create a snapshot removing the cluster flag from the volume group: # vgchange -cn VolGroup01 Volume group "VolGroup01" successfully changed # lvcreate --size 100M --snapshot --name snap /dev/vg00/lvol1 Logical volume "snap" created What problem can arise meanwhile the cluster flag is disabled? Should I just avoid any change to the volume group (lvcreate, lvextend, etc...) or it might lead to really bad behaviours in any way? Thanks in advance, -- Federico. _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
