Current setup is as mention below;
Exchange 2010 (both ent+std) installed on 5 different location and in active directory we have 3 sites A, B, C ( remaining 2 sites pending)
Site A is HO office and Site B will be DR of it and having separate DAG A (3 Mbx srv - 2 Mbx are in Site A and 1 Mbx in Site B but not installed pending)
Site B is DR site for all sites but as of now all 30 databases are active from it.
Site C is Prd site but as of now its passive node and site A and B are part of same DAG B (4 MBX srv - 2 mbx in site B and 2 mbx in site C).
Currently All DNS record are pointing to Site B in DNS like OWA etc.
CAS Array details of 3 sites:
Site A = sitea.xyz.com ( In site A windows NLB is used)
Site B = siteb.xyz.com ( In site A hardware load balancer is used)
Site C = sitec.xyz.com ( In site A hardware load balancer is used)
My Concerns are;
1. We have to move all mailbox database from Site B to Site C. what are think i have to ensure to get it done without any issues? Also ensure all CAS Exchange web services (like free\busy etc) work properly?
2. We have to use single url (mail.xyz.com) for OWA\active sync to access for each site (internally)?
3. We have Vasco integrated for external authentication so how we configure OWA url for that?
4. Also let me know the impact of all while performing above changes?