Is there types of DAG in exchange 2010 like clustering 2007 or there is one type?

Is there types of DAG in exchange 2010 like clustering 2007 or there is one type?
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Nope, in Exchange 2010 there is just one clustering type called DAG (Database Availability Group) A dag can be configured like Exchange 2007 CCR (Cluster continuous Replication) or SCR (Standby Continuous Replication) but it doesnt support the shared storage aproach of Exchange 2003 or Exchange 2007 SCC (single copy clusters)

You have to provide each mailbox server in the DAG it's own storage however the storage type does not need to be the same between all nodes.

For example, node 1 can use SAN storage, node 2 could use direct attached storage and if you had a 3rd node in an offsite datacenter, this could be a VM using virtual storage. Hope this helps.

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IhabAuthor Commented:
so the concept of quorum?
Warm Regards
You no longer use a disk majority Quorum, The advise is if your DAG contains an equal number of nodes, then you provision a file share witness to act as quorum however this is not needed if your DAG cluster contains an odd number of nodes. Typically the file share witness is created on a Hub Transport server but in envonments co-locating all roles on the same server this isnt possible. In scenarios like this the advise is to host the FSW on a file server and not on a domain controller. This is because the group Exchange Trusted Subsystem needs to be added to the server.

Hope this helps.
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