You may want to run multiple licenses servers. Running multiple servers allows you to continue to work, even if one of your license servers is down.
To obtain a license in a multiple-server environment, a majority of the servers must be running.You can use a single license server or you can have as many as five servers.
If your machine is not always at your site, has occasional problems, or is not accessible to everyone on the network, you may want to use multiple servers. In most cases, however, a single server is preferred.
Note: A two-server configuration is not recommended. If one server is down, a majority of servers is not running, and you will not be able to obtain a license.