1 - Enterprise ArcGIS 10.5 with ArcGIS server federated with ArcGIS Portal
2 - We have two ArcGIS server and two portal machines available trough two Web adapter machines. and these two web adaptors are also HA using hardware load balancer. On every webadpater machine we have two instances one for portal and another for arcgis server.
We want to have DR site do we need have same number of machines at DR site. Here I mean is it mandatory for DR site to HA.? If not then what can be disadvantage
I went through Disaster recovery and replication—Portal for ArcGIS (10.5.x) | ArcGIS Enterprise it says the primary and standby environments must be duplicated. Each data center must have the same number of machines