Database dismounting when DAG member fails

I recently have a strange problem.

I installed 2 exchange hardware both with all the 3 roles

and created a DAG with these members. But when I try to shut down one server all the databases will get dismounted until I start the stopped DAG member.

What could be wrong in  my config?
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MAS (MVE)EE Solution Guide - Technical Dept HeadAsked:
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MAS (MVE)EE Solution Guide - Technical Dept HeadAuthor Commented:
I fixed by recreating the witness folder and updated in DAG properties
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MAS (MVE)EE Solution Guide - Technical Dept HeadAuthor Commented:
Alternate witness server is not showing any files in the folder.
Is that normal or I made some mistae?

Please help
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Exchange_ImranCommented:
Hi,

Alternate Witness Server – originates from the fact that its intended purpose is to provide a replacement witness server for a DAG to use after a datacenter switchover. When you are performing a datacenter switchover, you’re restoring service and data to an alternate or standby datacenter after you’ve deemed your primary datacenter un-usable from a messaging service perspective.

Although you can configure an Alternate Witness Server (and corresponding Alternate Witness Directory) for a DAG at any time, the Alternate Witness Server will not be used by the DAG until part-way through a datacenter switchover; specifically, when the Restore-DatabaseAvailabilityGroup cmdlet is used.

The Alternate Witness Server itself does not provide any redundancy for the Witness Server, and DAGs do not dynamically switch witness servers, nor do they automatically start using the Alternate Witness Server in the event of a problem with the Witness Server.

The reality is that the Witness Server does not need to be made redundant. In the event the server acting as the Witness Server is lost, it is a quick and easy operation to configure a replacement Witness Server from either the Exchange Management Console or the Exchange Management Shell.

http://blogs.technet.com/b/exchange/archive/2011/05/31/exchange-2010-high-availability-misconceptions-addressed.aspx

Regards
Imran Shariff
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MAS (MVE)EE Solution Guide - Technical Dept HeadAuthor Commented:
You mean no need to configure alternate witness server?

Awaiting your reply
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MAS (MVE)EE Solution Guide - Technical Dept HeadAuthor Commented:
Appreciate if you answer my last question.
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Exchange_ImranCommented:
Hi,

sorry for the late reply,

The alternate witness server is used when you have a single DAG that stretches across two or moreAD sites. The witness server lives In the primary datacenter, and is used as a vote when the DAG contains an even number of nodes. If you had a 4 member DAG, with two members in each datacenter, your witness server in the primary DC would be used as vote& in order to maintain quorum. For Example if you lost a mailbox server in the primary Datacenter, the DAG would still maintain quorum, because of the witness server, and if you lost both mailbox servers in the primary DC the DAG would still maintain quorum, because you still have 2 mailbox servers in the other AD site, plus your witness server is still up. Now if you were to lose the entire primary AD site, you would need to configure an alternate witness sever in the other AD site that contains the other exchange 2010 servers, for the DAG to maintain quorum. This is part of a datacenter siwthc over.


Regards
Imran Shariff
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Exchange_ImranCommented:
Hi,

In short it is only used during a Datacenter Activation scenario with DAGs that span between two datacenters and are using Datacenter Activation Coordination (DAC) mode. During the normal course of operation it'll never be used and requires to use Restore-DatabaseAvailabilityGroup for it to be activated.

Hope i have answered to your question

Regards
Imran Shariff
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