Exchange 2013 DAG databases failing over nightly
Posted on 2014-09-30
I am having some difficulty with my DAG for exchange 2013. Every morning that I come in I find that my databases have moved over to another server automatically.
We have 6 servers on VMshere that takes snapshots nightly.
3 CAS servers in a CAS array
3 mailbox servers with 4 databases each.
I cannot find any reasoning as to why this is occurring nightly other than the snapshots. Unfortunately, I am not familiar with VSphere or the snapshots that are taken nightly, I do not do this task. I am just responsible for the exchange servers.
There is also no reasoning behind which server gets the database that morning. One morning I will find all the B mailboxes on A, the next possibly all the databases from A moved to B. Sometimes I will even see a combination of databases scattered across all three.
Has anyone seen this behavior before? Why is this automatically happening every night? (snapshots?)
Please let me know what information I can provide to assist with troubleshooting this problem.
Many thanks to the experts exchange community.