First Created & tested: 6/15/2016 - Raj Patel
Confirmed on customers setup: 6/16/2016

Tested on VIOS 2.2.4.10
=======================

These are the revised steps tested on nodes [ violab5 , violab6 ].

The example used is from [ short -> long ].
These can be reversed to perform [ long -> short ].

Verify these steps on your setups.


What likely already exists
0) /etc/hosts of target node  (short name first , in cluster with short name)
   10.99.3.6       violab6    violab6.aus.stglabs.ibm.com

1) All nodes [ resolve locally ]
   #cat /etc/netsvc.conf
   hosts=local4,bind4

2) The other node (!target) that is UP. [ violab5 here ]
   padmin:$ clstartstop -stop -m violab6

3) On Target node [ violab6 ] , update hostname to long name
   # chdev -l inet0 -a hostname=violab6.aus.stglabs.ibm.com
   inet0 changed

4) The other node (!target) that is UP. [ violab5 here ]
   i)  Split /etc/hosts entries to look like:
       10.99.3.6       violab6
       10.99.3.6       violab6.aus.stglabs.ibm.com

   ii) On same node as root: Change hostname from short name to long name.
       # /usr/sbin/chcluster -m violab6{cle_hostname=violab6.aus.stglabs.ibm.com}
         chcluster: Successfully modified cluster.

5) All nodes [ remove short name entry in /etc/hosts ] , will just have:
   10.99.3.6       violab6.aus.stglabs.ibm.com

6) The other node (!target) that is UP. [ violab5 here ]
   padmin:$ clstartstop -start -m violab6.aus.stglabs.ibm.com


Additional Notes From Customers test setup:
===========================================
Before:
10.70.51.134     vios103a
10.70.51.134     vios103a.wasserstrom.com
10.70.51.135     vios103b.wasserstrom.com
10.70.51.135     vios103b

NODES
        Name                            Shid    Uuid                                    Flags           N_gw    Site_shid       Site_uuid
       vios103a                        1       693c413c-2287-11e6-8005-f81ecfcfa1a3    00000000        1       1               693608d0-2287-11e6-8005-f81ecfcfa1a3

After:
10.70.51.134     vios103a.wasserstrom.com vios103a
10.70.51.135     vios103b.wasserstrom.com vios103b
NODES
        Name                            Shid    Uuid                                    Flags           N_gw    Site_shid       Site_uuid
        vios103a.wasserstrom.com        1       693c413c-2287-11e6-8005-f81ecfcfa1a3    00000000        1       1               693608d0-2287-11e6-8005-f81ecfcfa1a3