When viewing the cluster configuration with more than one exchange virtual server participating in exchange migration, multiple instances of the same type of agent are installed. For example in the cluster configuration A1-A2-P1 where A1 and A2 are active nodes and P1 is a passive node, the Mail Target Agents are installed on each Exchange virtual server. When looking at the services applet of A1, A2 or P1, two agents, Mail Target Agent (EVS1) and Mail Target Agent (EVS2) are listed. Is it normal?
This behavior is by design. Please refer to the resolution section for more details.
Exchange clusters running multiple virtual servers will have agents installed on every node. The name of exchange virtual server marked in parentheses reflects what EVS it belongs to. This is by design to provide the failover scenario where any node can own any EVS (Exchange Virtual Server).
For example, in the A1-A2-P1 Exchange cluster configuration, with EVS1 and EVS2 participating in different mail sync jobs MTA (EVS1) and MTA (EVS2) services will be listed on every node: A1, A2 and P1. A Cluster running more active nodes will correspondingly have more agents listed as services.