All approaches to reflect infrastructure requirements in the model, side-by-side

NFV Approach:

1. A capability type for Infrastructure requirements (nfv.capabilities.Compute)
2. A node type (nfv.nodes.Compute) with a capability of the nfv.Capabilities.Compute type
3. A VDU node "connects" to a Compute node using this Compute requirement.
   
   

node_templates:
  my_vnf:
    requirements:
     - host:
        node: my_compute
        capability: host
  
  my_compute:
    type: onap.nodes.Compute
    capabilities:
      host:
        properties:
          num_cpus: 4
          memory_size: 100 MB

ONAP Approach

1. A capability type for infrastructure requirements (onap.capabilities.Compute)

2. A VDU node expresses its infra requirements as a TOSCA requirements with the node_filter construct
   
   

   node_templates:
     my_vdu:
       requirements:
         - host:
             node_filter:
               capabilities: onap.capabilities.Compute
               properties:
                 num_cpus:
                   - equal: 4
                 memory_size:
                   - greater_or_equal: 100 MB                                        
   
   
   

   
   
   The approach can be extended into the "decomposed VDU variant":

   
   

   node_templates:
     my_vnf:
       requirements:
         - host:
             node: my_compute
             capabilities: host
   
     my_compute:
       type: onap.nodes.Container
       capabilities:
         host: #...
       requirements:
         - host:
             node_filter:
               capabilities: onap.capabilities.Compute
               properties:
                 num_cpus:
                   - equal: 4
                 memory_size:
                   - greater_or_equal: 100 MB