Because they need to check quota info before booting when the server node rebooted in an inproper way.
it takes ages to calculate quota and boot containers in big servers with lot’s of ram and lot’s of containers.
more info here:
http://forum.openvz.org/index.php?t=msg&goto=30102&
so basically
to fasten things up
if you are trying to boot your containers when you come back from a power failure:
vzquota off $VEID
vzctl start $VEID
vzquota on $VEID
yes I know, ploop is the answer, or is it?
I’m gonna check it later…