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mcse2007Flag for Australia

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routing OWA, ActiveSync & Outlook Anywhere

Hi,

I've setup my DAG in my lab (EX2010, EX2010B, EX2010C Witness Server).

I got some question about failing over from ACTIVE to PASSIVE then back to ACTIVE:

EX2010 is the ACTIVE database which is a member of a DAG group
EX2010B is the PASSIVE database which is a member of a DAG group
EX2010C is the witness server.

I have the following services running:
OWA
ActiveSync
OUtlookAnywhere


Questions:
How do I route OWA, ActiveSync and OUtlook Anywhere If the EX2010 (Active Database) becomes offline, EX2010B takes control of the PAM (primary active manager),

How do I re-route OWA, ActiveSync and OUtlook Anywhere Once EX2010 goes back ONLINE?

Do I have to manually seize PAM from EX2010B then move it to EX2010?

Appreciate your help in anticipation.
Avatar of Simon Butler (Sembee)
Simon Butler (Sembee)
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Automatically? Load balancer.
Manually, you would have both servers setup with the same URL and then adjust the DNS.

The DAG has nothing to do with client access. The DAG failing over has no effect on the CAS role. While you have a multi-role server you need to think of them as seperate servers.

Simon.
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ASKER

Hi Simon,

Some further questions:

Automatically?
Yes


Load balancer

* Is Load Balancer  an appliance or the Windows Network Load Balancer? But, I just want to transfer PAM role from EX2010B automatically to EX2010 once it goes back online



Manually, you would have both servers setup with the same URL and then adjust the DNS.
* Is this means,  if EX2010 goes offline, I will change the DNS entry (e.g mail.domain.com) then point its IP address to EX2010B?


The DAG has nothing to do with client access. The DAG failing over has no effect on the CAS role. While you have a multi-role server you need to think of them as seperate servers.

* Thank you
Hijacking the thread from Simon, I'll try to answer the questions to the best of my knowledge.

Is Load Balancer  an appliance or the Windows Network Load Balancer

if EX2010 goes offline, I will change the DNS entry (e.g mail.domain.com) then point its IP address to EX2010B?

Your entire chaos is around the half told fact that you haven't mentioned which box owns CAS Role, is it a separate server OR is it going to be on the same servers?

Here is the first story: Assumption#1: You own CAS on the same servers as Mailbox roles:
Now, if you have two servers (E2010 and E2010B) - you'll need to add them to a CAS Array. This Array IP would be pointed to a Load Balancer - LB should be smart enough to send communications (such as webmail - A.Sync) to the nodes on a round-robin basis or Least Cost Method, depending which nodes are alive.

So, a failover from Node1 to Node2 wouldn't affect the Load Balancer and how the Load Balancer works with your nodes. Only when the nodes aren't available the connections the Load Balancer would stop sending them to the failed nodes.

Mail flow would also be taken care by hub servers automatically.

Assumption#2: Separate server being used as CAS or Hub Server.

If you are using just 1 server as CAS and HUB Server, then there is no need to use any load balancer at all. However, the single server hosting CAS and HUB would be your single point of failure.

Regards,
Exchange_Geek
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Simon Butler (Sembee)
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Thank you all.

I'm confused or not understanding the product to fit  to my requirements?

Here's my primary aim:

If the whole EX2010 goes down, (e.g., corruption on EDB) i want to be able to connect to EX2010B both from OWA, ActiveSyn, OUtlook Anywhere and MS Outlook Client.

Now, I need to be able to route the traffic (e.g., OWA, ActiveSyn, OUtlook Anywhere and MS Outlook Client) back to EX2010 once it is back online.

What roles should be installed on the following servers:
EX2010
EX2010B
EX2010C

How do I achieve my "primary aim" with regards to DAG setup.
Do I need a DAG?
Do I need WNLB?
Do I need Clustering?

What is a CAS Array and how do you set that up?
Answer a basic question, where are you going to place your CAS Role?

On separate server or on your mailbox server, we'll answer the rest for you.

Regards,
Exchange_Geek
Scenario one:
EX2010: Mailbox, CAS, Hub
EX201B: Mailbox, CAS, Hub

Scenario two:
EX2010: Mailbox, CAS, Hub,
EX2010B: Mailbox, Hub

thank you.
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Thanks Exchange_Geek...appreciate your response.

I gather a hardware or virtual LB, for instance, does failover once it detects the primary CAS A goes down hence it will re route the OWA, Active Sync, Outlook MAPI to CAS B from Cas Array which is sitting in front of the load balancer?
You are correct sir.

Regards,
Exchange_Geek