Veritas apparently uses a technique in order to perform smooth backup.
AFAIK, the goal is to create two volumes groups and set up a soft RAID1
between them (of course, everything is on a SAN).
Everything runs like that during normal operation. When backup starts, their
agent can break the mirror, then pick up one the voume group from another
server whcih then can be backup without problem.
When backup is over, volume group is pick up back on the original server and
mirror is reconstructed...

My question is : is it possible to pick a volume group from another server
8may be there is a name for this technique)...

many thanks for your help