Database Mirroring Failover Databases Are "Disconnected"

SQL Server Administration
1

This is 2014
I configured db mirroring with Automatic Failover. So of course a witness server is in place.
I HAVE been able to fail over the database by using tjhe Failover option in the GUI nad fail back That works perfectly.
However when we force a failover by shutting down the primary/principal server,
the database at the mirror server shows "Principal/Disconnected"

Any ideas?
Thanks

2

It's because you shutdown the old principal server, so mirroring is now disconnected. That's what you'd expect when only one server is up.

So it worked as expected: the failover occurred, and mirroring is now in a disconnected state. Once you startup the server you stopped, mirroring will reconnect and start sending over the log records. The old principal will now be the new mirror server.

1 Like
3

Thanks, TaraKizer. That's good to know. Then it worked as intended.

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4

Tara I have one more followup. We're running on the failover server (formerly the mirror). When we bring up the original principal server, what should I see on the server that is now the principal? What status should the databases show?
This is HA with auto failover with a 3rd server as the witness.
Thanks

5

I'm going from memory here, but I believe it'll say synchronized, possibly synchronizing. That's if it was able to catch up. Depending on how long one of them was down, the log file might have grown a bit since it stores the un-mirrored transactions in there.