Describe the issue:

ODF upgrade process involves downtime (of very short time though) for applications using ceph/rbd pvc and noobaa obc, as there is a single instance of mgr running. Similarly, as there is a single instance of noobaa-db running, upgrade cause downtime of s3 applications.

The document should add a note about it so that admins are aware of it (as some customers run senstive workload on ODF)

Describe the task you were trying to accomplish:
Upgrade ODF 4.x to 4.y

Suggestions for improvement:
Add a note in the "Updating OpenShift Data Foundation" document that there will be downtime of a few minutes during ODF upgrade.

Document URL:

https://access.redhat.com/documentation/en-us/red_hat_openshift_data_foundation/4.12/html-single/updating_openshift_data_foundation/index#overview-of-the-openshift-data-foundation-update-process_rhodf

Chapter/Section Number and Title:

Chapter 3 and Chapter 4

Product Version:

All supported versions

Environment Details:
All supported environments

Any other versions of this document that also needs this update:
4.10, 4.11, 4.12

Additional information:
-