Hi,
The management group can contain multiple management servers to provide additional capacity and continuous availability. When two or more management servers are added to a management group, the management servers automatically become part of the three default resource pools and work is spread across the members of the pool. For custom defined resource pools, members are manually added. When a member of the resource pool fails, other members in the resource pool will pick up that member’s workload. When a new management server is added, the new management server automatically picks up some of the work from existing members in the resource pool.
For more information, please review the link below: