I would guess this "enumeration" means "walk"; e.g. doing backup. One
of the most-liked features that ZFS offers is snapshots. So I would
suggest telling GFS2 users/customers to use LVM snapshot AND making
sure GFS2 works well with Linux LVMm snapshot.
AFAIK, clustered volume group doesn't support LVM snapshots :
<quote>
LVM snapshots are not supported across the nodes in a cluster. You cannot
create a snapshot volume in a clustered volume group.
</quote>
from
http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html-single/Logical_Volume_Manager_Administration/index.html#snapshot_volumes
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