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Exchange 2013 (On 2008 Server R2) - Cluster issues when quorum lost

Posted on 2016-10-28
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Last Modified: 2016-11-13
9 Exchange 2013 mailbox servers all running on Windows 2008 Server R2. All part of the same DAG (so just one cluster).

Inadvertently, powerer off 5 of these mailbox servers - bad idea. According to my reckoning, due to odd number of members, the quorum should be relying on a majority count of members. Since it no lonfer has a majority then the databases should be dismounted on the remaining servers.

This didn't happen. The exchange databases stayed up - albeit the CAS servers went to 100%.

We then powered back up the 5 servers but the cluster did not recover on its own. On each of the 4 servers that did not power down the cluster status still showed down. A restart of the windows cluster service on each of the 4 servers sorted this out.

Question is :-

1. Any idea why exchange did not dismount DBs when quorum was lost?

2. Why did cluster not recover when the servers were back?
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Question by:paulfoel
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Expert Comment

by:Zaheer Iqbal
ID: 41863650
I would say this should be logged with Microsoft.
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by:paulfoel
ID: 41863743
If my client had a support contract....... :-(
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paulfoel earned 0 total points
ID: 41878515
Looks like powerinbg off DAG members is never a good idea.
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by:paulfoel
ID: 41885225
No other answers provided.
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