In certain cases, you might use multiple license servers in your network for the same reasons that you split a topology or choose different locations for Domain Managers: geographical requirements, corporate organizational requirements, or the network’s security design. Using multiple license servers requires the corresponding number of VMware Smart Assurance licenses.
When multiple license servers are used, each Domain Manager will use blocks of licenses from a specific license server. Therefore, the license blocks must be divided among multiple licenses and the appropriate license must be deployed to each license server. Then, the IP Availability Manager that relies on a specific license server will have the appropriate licenses to support the systems that it must manage.
The VMware Smart Assurance System Administration Guide provides more information about volume licensing.