Three-Server Redundant License Servers

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FLEXlm supports a set of three license servers to be used in a redundant manner. If any two of the three license servers are up and running, the system is functional and hands out its total complement of licenses.


The use of two license servers is strongly discouraged, because a set of redundant server nodes with only two server nodes gives you two points of failure. You must always have both server nodes running.

When redundant servers are started, they elect a master, which performs all licensing operations. The other two servers are there to provide a secure licensing mechanism in the event of hardware failure, or if the master server node needs to be rebooted. Should the master fail, if two servers are still running, one of the remaining two is elected master and licensing operations continue.