OpenStack: Unable to determine the amount of physical memory (no 'memory_mb' found in introspection_data)

Issue

• While deploying Red Hat OpenStack 16.2, the following error is observed:

tripleoclient.exceptions.PlanEnvWorkflowError: Workflow execution is failed: Role 'ComputeHCI': Unable to determine the amount of physical memory (no 'memory_mb' found in introspection_data).
clean_up DeployOvercloud: Workflow execution is failed: Role 'ComputeHCI': Unable to determine the amount of physical memory (no 'memory_mb' found in introspection_data).
Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/osc_lib/shell.py", line 136, in run
    ret_val = super(OpenStackShell, self).run(argv)
  File "/usr/lib/python3.6/site-packages/cliff/app.py", line 281, in run
    result = self.run_subcommand(remainder)
  File "/usr/lib/python3.6/site-packages/osc_lib/shell.py", line 176, in run_subcommand
    ret_value = super(OpenStackShell, self).run_subcommand(argv)
  File "/usr/lib/python3.6/site-packages/cliff/app.py", line 401, in run_subcommand
    result = cmd.run(parsed_args)
  File "/usr/lib/python3.6/site-packages/tripleoclient/command.py", line 32, in run
    super(Command, self).run(parsed_args)
  File "/usr/lib/python3.6/site-packages/osc_lib/command/command.py", line 41, in run
    return super(Command, self).run(parsed_args)
  File "/usr/lib/python3.6/site-packages/cliff/command.py", line 185, in run
    return_code = self.take_action(parsed_args) or 0
  File "/usr/lib/python3.6/site-packages/tripleoclient/v1/overcloud_deploy.py", line 1085, in take_action
    self._deploy_tripleo_heat_templates_tmpdir(stack, parsed_args)
  File "/usr/lib/python3.6/site-packages/tripleoclient/v1/overcloud_deploy.py", line 415, in _deploy_tripleo_heat_templates_tmpdir
    new_tht_root, tht_root)
  File "/usr/lib/python3.6/site-packages/tripleoclient/v1/overcloud_deploy.py", line 532, in _deploy_tripleo_heat_templates
    deployment_options=deployment_options)
  File "/usr/lib/python3.6/site-packages/tripleoclient/v1/overcloud_deploy.py", line 551, in _try_overcloud_deploy_with_compat_yaml
    deployment_options=deployment_options)
  File "/usr/lib/python3.6/site-packages/tripleoclient/v1/overcloud_deploy.py", line 275, in _heat_deploy
    plan_env_file)
  File "/usr/lib/python3.6/site-packages/tripleoclient/workflows/parameters.py", line 70, in invoke_plan_env_workflows
    raise exceptions.PlanEnvWorkflowError(msg)
tripleoclient.exceptions.PlanEnvWorkflowError: Workflow execution is failed: Role 'ComputeHCI': Unable to determine the amount of physical memory (no 'memory_mb' found in introspection_data).