we currently have a setup that consists of two PCs acting as servers, one is the primary and the other is the standby. We are receiving some values from an I/O device over the IEC-60870-5-104 protocol. We are then archiving these values before evacuating them to an SQL database.

We have configured each server to evacuate to it's own SQL database. Data from the primary server is evacuated fine but data from the standby server never seems to be evacuated.

Even when we take the primary server offline and stop runtime, the standby server (which becomes the primary server now) still does not evacuate to the SQL database.

The settings in the historian archives are the same for both the primary and standby server, the only difference being the actual SQL database that they are evacuated to.

Can anybody point me in the right direction as to what could be the problem?