[RHEV] Host failed to upgrade to "rhevh-6.5-20140725.0.el6ev" version.

Issue

• RHEV hypervisor failed to upgrade from rhevh-6.2-20120510.0.el6_2 to rhevh-6.5-20140725.0.el6ev and marked as install failed in the rhevm gui.
• vdsmd service is not running on the host and while tryin to start, its giving the below error message:

# /etc/init.d/vdsmd start
initctl: Job is already running: libvirtd
vdsm: Running mkdirs
vdsm: Running configure_coredump
vdsm: Running configure_vdsm_logs
vdsm: Running run_init_hooks
vdsm: Running gencerts
hostname: Unknown host
vdsm: Running check_is_configured
libvirt is already configured for vdsm
Traceback (most recent call last):
  File "/usr/bin/vdsm-tool", line 145, in <module>
    sys.exit(main())
  File "/usr/bin/vdsm-tool", line 142, in main
    return tool_command[cmd]["command"](*args[1:])
  File "/usr/lib64/python2.6/site-packages/vdsm/tool/configurator.py", line 260, in isconfigured
  File "/usr/lib64/python2.6/site-packages/vdsm/tool/configurator.py", line 162, in isconfigured
KeyError: 'getpwnam(): name not found: sanlock'
vdsm: stopped during execute check_is_configured task (task returned with error code 1).
vdsm start                                                 [FAILED]