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Implementing DAG in two site configuration

Posted on 2010-11-11
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Last Modified: 2012-05-10
OK so we currently have 2 active sites (A&B) with an Exchange 2010 SP1 server at each site, with users accessing both and are looking to implement DAG's. We also have a 3rd site (C) that is used for hosting our spam appliances and intranet servers. All sites are connected via a WAN, in the same AD domain and each site is in it's own AD Site.

My main concern with implementing DAG's in this configuration is what happens if I lose WAN connectivity?

I've read that SP1 now supports this type of configuration and helps prevent the potential 'split-brain' situation through the use of DAC (Datacenter Activation Coordination)

I have questions though.

Where should I place my primary FSW?
Should I configure an Alternate FileShareWitness server?

Example: Could I have Site A + FSW and Site B + AltFSW? What would happen if I lost WAN connectivity?

In the future we plan to implement a 4th site with an Exchange server.
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Question by:Jaws03
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Expert Comment

by:Akhater
ID: 34118332
>> My main concern with implementing DAG's in this configuration is what happens if I lose WAN connectivity?

the site with no file share witness will go down due to loss of quorum

>> I've read that SP1 now supports this type of configuration and helps prevent the potential 'split-brain' situation through the use of DAC (Datacenter Activation Coordination)

it does but wan connectivity issues are still not supported

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Author Comment

by:Jaws03
ID: 34139236
>> >> My main concern with implementing DAG's in this configuration is what happens if I lose WAN connectivity?

>>the site with no file share witness will go down due to loss of quorum


What would happen if I had an alternate file share witness at the other site?
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Expert Comment

by:Akhater
ID: 34140549
the concept of the alternate share witness is totally different, it is used only one you do a datacenter failover it is not for these scenarios

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You've built an email signature using raw HTML code in Office 365, but you can't review how it looks with Transport Rules. So you have to test it over and over again before it can be used. Isn't this a bit of a waste of your time? Wouldn't a WYSIWYG editor make it a lot easier?

 

Author Comment

by:Jaws03
ID: 34141079
So if WAN connectivity is lost all the users at the site with no FSW will not be able to access email even thought they have a functioning email server in the same location as them? Seems kind of limited?
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Akhater earned 500 total points
ID: 34141099
>> So if WAN connectivity is lost all the users at the site with no FSW will not be able to access email even thought they have a functioning email server in the same location as them?

exactly

>> Seems kind of limited?

DAG cross site was designed to be in a DR site as active/passive model and not as active/active. It could be better I know, hopefully exchange 2013 :)
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Author Closing Comment

by:Jaws03
ID: 34149846
NO
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Expert Comment

by:Akhater
ID: 34152820
@Jaws03 I am sorry but what do you mean by "NO" and why was this graded a B ? what was wrong in my answer ?
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