In NSX-T 2.4 documentation (NSX Manager VM System Requirements) are documented following NSX Manager Appliance sizes.
- The NSX Manager Extra Small VM resource requirements apply only to the Cloud Service Manager.
- The NSX Manager Small VM appliance size is suitable for lab and proof-of-concept deployments.
- The NSX Manager Medium appliance is targeted for deployments up to 64 hosts
- The NSX Manager Large appliance for larger-scale environments.