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Enterprise Software Thread, Exchange 2010 DAG Groups - WAN Requirements in Technical; Not sure if its my google skills failing me. Just trying to draw together a plan to replace 3 2007 ...
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    Exchange 2010 DAG Groups - WAN Requirements

    Not sure if its my google skills failing me. Just trying to draw together a plan to replace 3 2007 Exchange servers with 3 2010 Exchange servers with DAG.

    Currently 3 x 2007 Sp1 boxes (to be upgraded to SP3 Prior to any move) 1 located with customer 2 at seperate Datacenters. Changes are replicated VIA Double Take.

    What we are looking to do is move to Exchange 2010 with all servers in a DAG group - all this is fine and dandy in my planning. The only part I can't seem to find out is the WAN requirements of DAG groups. Anybody able to find any documentation/information.

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    As long as latency is less than 500ms between the members then you're supported.
    I would create multiple DAG's if you have active/active deployment.

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    glennda (9th August 2012)

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    glennda's Avatar
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    Quote Originally Posted by sukh View Post
    As long as latency is less than 500ms between the members then you're supported.
    I would create multiple DAG's if you have active/active deployment.
    Thanks Sukh - so as long as the latency is less the 500ms it doesn't matter on the speed of the connection? I'm planning three servers two in one Datacenter (offshore) and 1 in a secondary (connected via VPN in another country).

    They will not be Active/Active. This company handles financial data hence the need for multiple DC in various countries etc

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    Domino's Avatar
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    Should be fine, it's what we do between London and Boston. I'd suggest a new vlan for the DAG network though

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    glennda (9th August 2012)

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    glennda's Avatar
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    Awesome - all i could find was the info about the latency but nothing on bandwidth. Should be ok then

    Thanks!

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    The bandwidth should be good enough for a good user experience. If deploying cache mode then you may want to rolloit/stagger cache mode if bandwdith isnt good. Aswell as have multiple OAB generation servers.

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    glennda's Avatar
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    Quote Originally Posted by sukh View Post
    The bandwidth should be good enough for a good user experience. If deploying cache mode then you may want to rolloit/stagger cache mode if bandwdith isnt good. Aswell as have multiple OAB generation servers.
    Bandwidth to the main server is fine - its the bandwidth between the DCs which is/could be the issue as it shares it with all the other servers. I think though we should be ok.
    Last edited by glennda; 9th August 2012 at 10:05 PM.

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    cant remember on top of my head but there is gc/dc to exch ration, its on technet. Also I thouht you were concerned aboit the WAN bandwidth?

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    glennda's Avatar
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    Quote Originally Posted by sukh View Post
    cant remember on top of my head but there is gc/dc to exch ration, its on technet. Also I thouht you were concerned aboit the WAN bandwidth?
    the thing I was worried about was the link between the two datacenters. The end users will only ever talk to the second datacenter if the primary datacenter has a catastrophic failure (with two separate copies of everything in separate parts of datacenter) and dr is envoked and the dr site is brought online in which case a slight performance hit is accepted.

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    In that case you should be ok. I assume where ever the users are physically located they have a good connection to the primary dc. Otherwise that would be your concern.

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    something to help you with calculating bandwidth if you wish to go into depth.
    Office Exchange Client Network Bandwidth Calculator

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