In sdm 12.9 version. we have option Primary Server & secondary server & form sdm 14.1 onwards we have COnventional Method & advance availability option available.
I need to know whats the main difference in having Primary Server & Secondary Server option in 12.9 sdm AND Advance Avaialbility Option in 14.1 or later version???
In advance availability option i know we have Standby Bg and app server which is complete application failover architecture
whereas the option in 12.9 sdm (primary & secondary server) has also failover architecture like if primary is down then seconday will be up and viceversa ...