There are several ClearCase server host roles, and the order of installing ClearCase hosts is important. Most of the roles can be combined to one server, but consider separating at least VOB and view servers (see Figure 6-1 on page 71 and Figure 7-1 here).
Figure 7-1. ClearCase server roles
If you decide to start with one server only, you can use DNS alias names for each ClearCase role. Then, when time comes to separate the services, you can change the aliases in the DNS to point to the new hosts.
However, if you are using this approach, notice that ClearCase caches effectively, and it takes some time to flush the caches. You ...