To start Xen PV/HVM:
On the xen node try to start the vps by hand:
xm create /home/xen/vm101/vm101.cfg
Mass Starting Virtual Servers:
On the xen node run:
CFGS=/home/xen/vm*/;for cfg in $CFGS;do xm create $cfg*.cfg;done
On the Openvz node run:
CFGS=`vzlist -S -Ho ctid`;for cfg in $CFGS;do vzctl start $cfg;done
On the KVM node run:
CFGS=/home/kvm/kvm*/;for cfg in $CFGS;do virsh create $cfg*.xml;done