https://vox.veritas.com/t5/NetBackup/Move-a-media-server-under-the-control-of-another-master-server/td-p/193896
– Stopped all services (bpdown)
– Edit registry HKLM\SOFTWARE\Veritas\NetBackup\CurrentVersion\Config\EMMSERVER
– Changed above key value to new EMM Server which happens to be my master
– Edit HKLM\SOFTWARE\Veritas\NetBackup\CurrentVersion\Config\Server
– Removed my previous master server from the list and placed the new one at the beginning of list
– In Backup, Archive, Restore gui deleted the old master entry
– Started all services (bpup)
Master Server: (Linux)
– Added MEDIA_SERVER and SERVER entry to bp.conf
– Reread into memory the bp.conf file (bprdreq -rereadconfig)