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Updated February 14, 2017
The NTA Flow Storage Database and subsequently, the NTA Collector services go down after a successful HA (High Availability) failover occurs when the NTA Flow Storage Database resides on either the Primary Polling Engine or an Additional Polling Engine.
If the NTA Flow Storage Database resides on the Primary Polling Engine, this service failure occurs when the failover switches the active server from the Primary to the Secondary. If the NTA Flow Storage Database resides on the Additional Polling Engine, the opposite conditions will apply.
All Orion High Availability environments with NTA
This is caused by the normal functioning of HA (High Availability). Thus, the migration of the NTA Flow Storage Database to a dedicated server as detailed below is required.