The FLEXlm license key and license server are independent of LSF clusters and LSF server hosts. You can organize your hosts into clusters any way you choose. The license server counts only the total number of hosts running LSF; these hosts can belong to any cluster in your network. As long as all your hosts can contact each other on the network, you should request a single license key that covers all the hosts on which you plan to run LSF.
FLEXlm normally runs the license server daemon on one host. LSF tolerates failure of the license server daemon for up to 60 hours, as long as the LSF Load Information Manager (LIM) on the master host is not restarted or shutdown. In spite of this, if you are concerned about reliability, you can run the license server daemon on three hosts. Software licenses are available as long as two of the three license servers are available
You should run the license server on the host that is the NFS server for the LSF software. That way the licenses are available whenever the software is. However, it is not recommended that you make the license server host the same as the master host for the cluster. If you do this, and the master host goes down, the backup master that takes over will not be able to check license tokens out from the license server on the original master, which has failed.
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