VxRail: Initial Configuration with External vCenter 7.0 Update 2 Fails with Error: Failed to Add Host to VDS VMware HCIA Distributed Switch

When attempting to do an initial configuration (or First Run) of VxRail versions 4.7.300 - 4.7.411 or 7.0.000 - 7.0.101 with External vCenter 7.0 Update 2 you may experience the following:

• The Dell Technologies VxRail Deployment Wizard UI displays the message "VxRail Cluster Configured Failed" at the "Host Add into VDS" step
• The following error is displayed in the Dell EMC VxRail Deployment Wizard UI:
  Failed to add host xxx to VDS VMware HCIA Distributed Switch yyy
  
• vCenter UI is showing the following error while performing a "Reconfigure vSphere Distributed Switch" task:
  The operation is not supported on the object. Host xxx is not compatible with the VDS version 7.0.2
   
• In VxRail Manager in the /var/log/microservice_log/dayone.log log file, you may see an error similar to:

  2021-04-29-11:08:23 microservice.do-network "do_common.exceptions.OperationException: OperationException: {""message"": ""Add host lab-02-169-02.crk-lab.local to vds VMware HCIA Distributed Switch ck-vsan-stretch-13g 8a9642 did not complete successfully: (vmodl.fault.NotSupported) {\n dynamicType = ,\n dynamicProperty = (vmodl.DynamicProperty) [],\n msg = 'The operation is not supported on the object.',\n faultCause = ,\n faultMessage = (vmodl.LocalizableMessage) [\n (vmodl.LocalizableMessage) {\n dynamicType = ,\n dynamicProperty = (vmodl.DynamicProperty) [],\n key = 'com.vmware.vim.vpxd.dvs.notSupportedHostVersion.label',\n arg = (vmodl.KeyAnyValue) [\n (vmodl.KeyAnyValue) {\n dynamicType = ,\n dynamicProperty = (vmodl.DynamicProperty) [],\n key = 'host',\n value = 'xxxxxxx.xxxxx.local'\n },\n (vmodl.KeyAnyValue) {\n dynamicType = ,\n dynamicProperty = (vmodl.DynamicProperty) [],\n key = 'version',\n value = '7.0.2'\n }\n ],\n message = 'Host lab-02-169-02.crk-lab.local is not compatible with the VDS version 7.0.2'\n }\n ]\n}"", ""bundle"": """", ""prefix"": ""do_common.exceptions.OperationException"", ""key"": """", ""field"": """", ""error_code"": ""0"", ""exit_code"": ""-1"", ""params"": []}"

• VxRail 4.7.300 - 4.7.411 supports a maximum vDS version of 6.6.0.
• VxRail 7.0.000 - 7.0.101 supports a maximum vDS version of 7.0.0.

• Creates a new vDS using the latest version available with that build of vCenter which is vDS version 7.0.2
• Attempts to add or register the VxRail hosts to the new vDS
• This step fails as those builds of ESXi (which support a maximum vDS version or 6.6.0 or 7.0.0) cannot be added to a vDS version 7.0.2

• For VxRail 4.7.510 and later, the vDS version will be 6.6.0
• For VxRail 7.130 and later, the vDS version will be 7.0.0

Workaround

• Make sure you are at the part where the deployment has failed with the error in the screenshot above and no other attempts have been made to correct the issue. If not, the script may break the process.
• Upload the attached python script to VxRail Manager.
• Run the script as root:

  python vds_redeploy_7_0_010.py -a "VCENTER-IP-OR-FQDN" -u "VCENTER-ADMIN-USER" -p VCENTER-ADMIN-USER-PASSWORD -n "VDS-SWITCH-NAME-FROM-VCENTER-UI" -v 7.0.0
  
  Where:
  -a = vCenter IP or FQDN
  -u = vCenter administrator user
  -p = Password
  -u = vDS which is currently at version 7.0.2 that we are trying to add the hosts too, name will likely include spaces so enclose in double quotes
  -v = vDS version to set the switch too, in this case we need to change it from a 7.0.2 vDS to a 7.0.0 vDS to allow us to add pre-7.0u2 hosts to it
  
  Example:
  python vds_redeploy_7_0_010.py -a "172.16.10.201" -u "administrator@vsphere.local" -p Password123! -n "VMware HCIA Distributed Switch ck-vsan-stretch-13g 8a9642" -v 7.0.0
  Go back to initial configuration / deployment web UI and click "TRY AGAIN".