openshift-installer shall fail when the arch of the vm type mismatch with the architecture.    

4.17   

Always

    1.download amd64 installer
    2.generate the install-config.yaml
    3.edit install-config.yaml,to use s390x vm type (eg:bz2e-4x16,bz2-8x32), architecture is amd64

controlPlane:
  architecture: amd64
  hyperthreading: Enabled
  name: master
  platform:
    ibmcloud:
      type: bz2-8x32
  replicas: 3

compute:
- architecture: amd64
  hyperthreading: Enabled
  name: worker
  platform:
    ibmcloud:
      type: bz2-4x16
  replicas: 3  

4. invoke the installer 

When master node use s390x arch vm type: 
Install failed after 15 minutes, “Image OS architecture amd64 is not supported by the instance profile bz2-8x32”

When worker node use s390x arch vm type:
Install failed after more than 1 hour.”Got 0 worker nodes”    

Prompt the vm type is not match with the architecture immediately.