Running engine-setup fails when using a seperate /var partion (seperated from  /) In /var/log/ovirt-engine/engine-setup_xxxxxxx.log:

  2012-02-18 14:46:16::ERROR::engine-setup::614::root:: Traceback
  (most
recent call last):
    File "/usr/bin/engine-setup", line 612, in _linkHttpParams
      os.link(target, link)
  OSError: [Errno 18] Invalid cross-device link

  2012-02-18 14:46:16::ERROR::engine-setup::728::root:: Traceback
  (most
recent call last):
    File "/usr/bin/engine-setup", line 712, in _editRootWar
      _linkHttpParams()
    File "/usr/bin/engine-setup", line 615, in _linkHttpParams
      raise Exception(output_messages.ERR_EXP_FAILED_ROOT_WAR)
  Exception: Could not copy ROOT.war configuration into Jboss profile

The installer tries to make a hard link to somewhere is /usr to /etc/ovirt-engine, which is not possible since /usr is on a separate
disk partition.

A workaround is to move /etc/overt-engine to
/usr/local/etc/ovirt-engine en create a symbolic link in /etc/