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exchange 2010 adding dag ipaddress

I currently had a DAG spanned across 2 data centers.  there are 2 servers/copies in each data center.  I'm moving the passive servers to a new 3rd data center.  The plan calls for moving only half the copies at a time in order to maintain the capability while servers are in transit.  As an initial step I added an IP address to the DAG for the third data center using:

Set-DatabaseAvailabilityGroup <DAGName> -DatabaseAvailabilityGroupIpAddresses IP1, IP2, IP3

This command went through without issue and Get-DatabaseAvailabilityGroup does reflect the change.  My only cause for concern is that the Cluster manager still only reflects the original 2 IP Addresses.  This could be because the servers haven't been moved or re-ip-ed yet.

Does anyone have any insight on this?

Let me know.  Thanks.
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Jian An Lim
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why setup 3rd IP address?

you also need to make sure the heartbeat NIC can communicate with each other.
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Solution met the goal of establishing a new configuration with no interruption of service.