MES middleware host licensing considerations

Usually the more MES middleware hosts there are in the system, the better the system will perform.

Where possible, have the MES middleware host running locally. However, note that each MES middleware host requires a license.

The MES middleware is fully multi-threaded and uses multiple CPUs. However, other restrictions related to handling transactions limit the number of sessions that one MES middleware host can support.

Starting with MES 2017, each MES middleware host acquires an MES Middleware count from the License Server. Depending on the size of the license purchased, the number of MES middleware instances that are licensed will start at 6 and increase with larger size licenses. The number available and in use is shown in the License Manager. Additional MES middleware licenses can be purchased as an add-on to any system.

For example, a system with the following servers and five MES Middleware licenses would include a local MES middleware host on each server:

• One Applications Servers

• One Work Tasks Server

• One Web Server

• Two Terminal Servers