This might seem obvious, but when a passive copy is in a "failed and suspended" state, backup applications won't truncate the logs on the active copy? To me, the answer has to be yes because these logs must be shipped over the passive copy. So the resolution is to reseed the passive copy?
Event ID 2046 on the exchange servers are only recording events for 2 of the 4 databases. Shouldn't there be an event for each database indicating that the logs files are going to be truncated.