Exchange 2013 DAG - Mailbox Databases are automatically Activating on another Server

We're testing an Exchange 2013 DAG setup. 3 total multi-role servers, configured via MS Best Practices. Production NIC and Replication NIC for all DAG traffic.

The issue we're running into, is every night, the mailbox databases Activate on Server 3. Each morning, we rebalance them. 1 mailbox database on Server 1, 1 mailbox database on Server 2 and 1 mailbox database on Server 3.

I come in the next day, all 3 databases are Active on Server 3.

I'm scanning the Event logs, however, there are thousand generated over night.

I'm hoping someone can point me in the right direction. Does Exchange automatically balance them?
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Miguel Angel Perez MuñozCommented:
This failover would be causes by many things, from traffic lost to Exchange manageability service.

Try do a search on event viewer looking for failover events (on applications and services logs > Microsoft > Exchange > High availability > Operational). Consider check manageability services: Get-ExchangeServer | Get-HealthReport | where {$_.alertvalue -ne "Healthy"}

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Are all DAG members on the same site?  If they are all on the same site are they all on the same switches?  Just narrowing down the possible network issues.

Also, are you backing up these test boxes over night?  And if so, what with?

As already suggested the event logs hold the key and are typically very chatty when fail overs are instigated etc
danherbonAuthor Commented:
All DAG members are in the same site. Same switches.

We're not backing it up in test right now.
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