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:
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.