Outdated. Short YouTube video about why to switch from xm to xl.
xend is depricated since Xen 4.1. Thus .. watch
First crash was with xen-create-image. Failed with
Running command '/usr/lib/xen-4.4/bin/xl create /etc/xen/srv-sz-1.cfg 2>&1' failed with exit code 768. Aborting
Well, default toolstack in /etc/xen not set.