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Automatic failover in SQL Mirroring

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Hi Team,

We have 3 servers and 7 databases, Principal (P) and Mirroring (M) and Witness (W) server, and all 7 databases running in P as primary, and Mirrored in M server.

Now Mirrored server M is rebooted, and databases are failover to W, now its became M, and old M is now acting as W.

Now we can see only few of them 4 databases running in P as primary, and 3 are running in new Mirror as primary.

P is primary for 4 databases 

New M is primary for 3 database.

New W is empty..

Just wanted know , why only few databases failover to another server, what would be reason..?


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