We have two ACS servers and Primary server is also a log collector. We are having Version : 126.96.36.199.3 on both primary and secondary servers. We planing to upgrade to version 188.8.131.52.1.
My question is can I promote secondary to primary, de register, delete old primary, upgrade old primary to 5.7 and then re register old primary back to new primary(old secondary). Then promote new secondary to primary, de register old secondary, delete old secondary, upgrade it and then re register it back. Can I follow these steps? Or do I need to de register primary and secondary, upgrade separately and re register?