For Interaction Manager resources, failover happens only when both of the following conditions are met.
The value of the desired primaries is less than the value of the maximum primaries.
One of the nodes is unavailable.
After failover, the fault monitor will not restart the resource on any cluster node if both of the following conditions occur.
The values of the maximum primaries and desired primaries of the Interaction Manager resource group are the same.
The fault monitor has completed restarting the Interaction Manager resource the number of times that the Retry_count property specifies.