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3 Member DAG - Need manual failover scenario & power down sequence & maintain quorum.

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3 Member DAG - Need manual failover scenario & power do... - 28.Jun.2014 2:32:11 PM   
TGuthrie

 

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Joined: 28.Jun.2014
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I just started at a company that has an Exchange 2010 SP3, 3 member DAG. Not the ideal HA design.
All servers are Windows 2008 R2.

Site A has two DAG members.
Site B has one DAG member (DR Site).

Scenario:
We need to perform a controlled power down in our Site A datacenter to correct some power utilization issues.
Once the power work is completed we will need to fail back to Site A.

Issue:
If we power down our two DAG members in Site A we will not have a Majority Node Set (Quorum) & the DAG member in Site B will dismount the databases. We do not have the hardware resources to add another DAG member in Site B.
Database copies are across all three DAG members.

Questions:
How can we perform the controlled power down of Site A datacenter & maintain the quorum in Site B & keep the databases up while the power work is completed in Site A?

Once the work is completed in Site A, we would then need to fail back to Site A.
What would the power up sequence be in Site A for the 2 DAG members & to get the database copies mounted on DAG member 1 or 2?

I'm looking for advice on the power down sequence in Site A so that we can failover to the third DAG member in Site B without DAG member 3 dismounting the databases.

Once the power work has been completed we would then need the sequence to power the two DAG members in Site A back up & then fail back to DAG member 1 or 2 with all three DAG members back online.

Thank you.
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