The following procedure may be helpful in this rare but important case:(Does not seem to take long time, but may be an automated simlar to SRM use:
Recovery the Management/control plan:
- Log in to secondary NSX Manager and then Promote Secondary NSX Manager to Primary by: Assign Primary Role.
- Deploy new Universal Controller Cluster and synchronize all objects
- Universal CC configuration pushed to ESXi Hosts managed by Secondary
- Redeploying the UDLR Control VM.
Similar Threads and Disaster Recovery with NSX and SRM Document is below:
Basic NSX Question in Dual Site Setup https://communities.vmware.com/message/2593791#2593791
Failover between sites with Primary and Secondary NSX Manager Configuration - What about the controllers?https://communities.vmware.com/thread/535356
Disaster Recovery with NSX and SRM https://communities.vmware.com/docs/DOC-31692
This Document "Handling Full Site Failure" heading discuss in detail how to provision secondary site procedure.