Describe the issue:

Hello,

In our documentation [1] we specify the minimum requirements when deploying ODF in external mode, but it's not clear the minimum number of worker nodes we need in OCP when using ODF external.

I believe the minimum is two worker nodes following OCP recommendations [2] but I think clarifying this in ODF documentation is very useful for certain customers.

If you need further information, please let me know.

Thanks! Regards

[1] https://access.redhat.com/documentation/en-us/red_hat_openshift_data_foundation/4.14/html/planning_your_deployment/infrastructure-requirements_rhodf#resource-requirements_rhodf

[2] https://docs.openshift.com/container-platform/4.14/installing/installing_bare_metal/installing-bare-metal.html#machine-requirements_installing-bare-metal