are the steps to migrate from 5.5 to 6.5 with non-stop clustering?
Only with HA, without DRS.
1 - Install new vCenter 6.5
2 - Create datacenter;
3 - Create cluster;
4 - Add host A in version 5.5 in the vCenter 6.5 cluster;
5 - Add host B in version 5.5 in the vCenter 6.5 cluster;
6 - Install Update Manager;
7 - Import ISO to Update Manager;
8 - Migrates servers from host A to host B;
9 - Put host A on maintenance;
10 - Apply new version via Update Manager on host A;
11 - Remove host A from maintenance;
11 - Migrate servers from host B to host A already with the new version;
12 - Place host B in maintenance;
13 - Apply new version via Update Manager on host B;
14 - Remove host B from maintenance;
15 - Balancing servers between hosts.