You must deploy sufficient NSX Edge node resources to replace the Edge Services Gateways in the NSX for vSphere environment.
Number of Edge Nodes
If high availability is not configured, you need one NSX Edge node to replace each Edge Services Gateway with a northbound connection outside of the NSX for vSphere environment. If high availability is configured, you need two NSX Edge nodes.
You do not need to replace any Edge Services Gateways that are connected to a Distributed Logical Router to provide one-arm load balancer services, but are not providing routing services.
Size of Edge Nodes When Load Balancer Is Not Deployed
All NSX Edge nodes are added to the same NSX Edge cluster. All nodes in an NSX Edge cluster must be the same size.
If you do not have load balancers deployed, deploy NSX Edge nodes to provide sufficient capacity to replace the current Edge Services Gateway in NSX for vSphere.
If all NSX for vSphere in your environment are the same size, you can figure out the correct size of NSX Edge node using this table.
|NSX for vSphere||NSX-T|
|Compact and Large||Small|
|Edge Services Gateway Size||Memory||vCPU|
|Quad Large||2 GB||4|
|NSX Edge Node Size||Memory||vCPU|
Size of NSX Edge Nodes When Load Balancer Is Deployed
If you have a load balancer deployed, you must deploy NSX Edge nodes that have the sufficient resources for your configuration.
See "Scaling Load Balancer Resources" in the NSX-T Data Center Administration Guide.
All NSX Edge nodes must be of the same size so that they can be members of the same cluster.