Known bugs

root@xmanage:~# xmanage server edit MyServer disklimit
...
The filesystem is already 131072 (1k) blocks long.  Nothing to do!

That happens because of the loop devices, which are used for servers. Resizing a filesystem may cause server's files to break, so resize2fs doesn't allow shrinking loop devices. To avoid this, we recommend to reinstall server with the required disk space.