Understanding Exchange DAG

If I understand in Exchange 2010 , we can set up DAG to have databases replicated.

what I do not understand if the databases are in the SAN, how can a Database be created with the same name? for instance DB1 Active copy is in EXCH1 and want the passive copy  in EXCH2 (in the SAN , not on the local hard drive)

Thank you
jskfanAsked:
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wshtyCommented:
so, are you asking for a way to change the path, of the passive DB replica, or did i misunderstand you?

edit: please look into these EE posts opened by other members:
http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_27553704.html

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_27074679.html
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jskfanAuthor Commented:
I meant how can a Database have the same name in the same drive?
Unless if Exchange will rename it.
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Bruno PACIIT ConsultantCommented:
Hi,

I think you misunderstood the way DAG clusters work in Exchange 2010.

Forget all you know about previous Exchange 2003 clusters that needed a shared drive on a SAN. With Exchange 2010 DAG each mailbox server has its own drive (it can be a local attached drive, a LUN on a SAN, etc...). THERE IS NO COMMON DRIVE

So each DAG member must have access to its own dedicated storage LUN.

Also, having 2 DAG members using SAN LUNs on the same SAN enclosure is not at all a good idea ! You would loose simultaneously all the database in case of an enclosure failure.
The DAG is made to avoid any single point of failure, so the good idea is to dedicate LUNs for each mailbox server and make things so that these LUNs are stored on different SAN farms or at least different enclosure.

Have a good day.
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jskfanAuthor Commented:
well explained...Thanks!
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