[linux-lvm] xfs_freeze & lvm2

[Rich]

i am not subscribed, so i would be thankful if i could get a reply with 
cc. thanks.

i tried making snapshots of xfs filesystem on lvm2. if xfs was frozen, 
lvcreate stopped at

	Suspending space-data
          dm suspend space-data  N

issuing xfs_freeze -u allowed the process to continue.
in this list, Thu, 09 Jun 2005 Klaus Strebel wrote :

"with LVM2 the XFS filesystem is 'frozen' automaticly on the mount 
-onouuid,ro ( not quite sure, but probably also for LVM1 ..., think it's 
in the XFS code ).
So, forget xfs_freeze."

as i understand it, consistent copy is created when lvcreate is issued, 
not when snapshot volume is mounted - is this right ?
if so, shouldn't filesystem also be frozen when a snapshot volume is 
created ?
if it actually is done together with snapshot, does this mean that i 
really can forget about xfs_freeze and just create snapshots ?
must i specify ro in mount options or is this optional ?
-- 
  Rich