The WebSphere CloudBurst appliance Web GUI currently respects case sensitivity with regards to hostnames. Care should be taken to be consistent with respect to case when defining hostnames.
The IBM WebSphere CloudBurst Appliance Web GUI currently respects case sensitivity with respect to hostnames in cloud groups. It is important to be consistent with use of upper and lower case when defining hostnames (i.e. the name "MyHost1" would be treated as a different hostname than "myhost1" for example).
If the two are not truly unique hosts, then hypervisor management issues may arise and recovery would necessitate deletion and recreation of all virtual machines.
For more information, refer to the product documentation.