XenServer 6.x removes auto-start vm option!?

Yes, they removed this feature.  So basically, if you physical machine reboots, none of the VMs will come up.  Anyway, there are various solutions, but the simplest one is to add to the bottom of


/etc/rc.d/rc.local

the following 2 lines:

sleep 30

xe vm-start tags=autostart --multiple

Then, add a tag to each VM, autostart.

This info comes from the post here:

http://www.raido.be/knowledge-center/blog/detail/xenserver-6-auto-start-vms