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Garry Shape
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Exchange 2010 - Two-member DAG questions

I've been going over DAG setup for an Exchange 2010 and am a bit confused about how it works.

Looking at the "Database Availability Group Design Examples" at https://technet.microsoft.com/en-us/library/dd979781(v=exchg.141).aspx, I find the following two-member DAG to seem easiest and most applicable to my environment.

The diagram is shown as follows:
two-member-dag-diagram
This raises a couple questions:

1. If databases are "Passive", what does that mean?

2. Since a network load balancer is used, what if somebody whos mailbox is on an "Active" database is directed by the Load Balancer to the other mailbox server where their database is "Passive".

3. What's the availability look like if both DAG members are running Client Access/Mailbox/HUB roles? Would it be wise to add a third member to the DAG and then give it only the Client Access or only Mailbox role and add a delayed replication, whereas the other 2 would be immediate replication?
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Amit

8/22/2022 - Mon
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Amit

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Leroy Luff

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Garry Shape

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Ok so the active database doesn't have to be on the Client Access Server, just a mailbox server.
I guess the diagram was confusing me
If active database "DB1" is on server "EX1", and "EX1" gets powered off, then the passive "DB1" on "EX2" will become active?
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Garry Shape

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So the active databases depicted are split between servers just to alleviate the load on a the servers they are active in?
Amit

No, it is not like that, Active DB exist on only one server and passive gets updated to become active.
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William Peck
Garry Shape

ASKER
So would this look right?

And MAIL9 and MAIL10 would have to be the same in terms of capacity, hard-drives/partitions?

DAG-Diagram.png
Amit

That's correct.