1. Proposed title of this feature request
Allow partitioning modification for new OCP provisioned nodes of an existing cluster) during node provisioning.

2. What is the nature and description of the request?

• After cluster installation, the only supported way to create partitions is using systemd units via MachineConfig: https://access.redhat.com/solutions/4952011
• This limitation comes because ignition.storage.disk could not be modified after installation time: https://github.com/openshift/machine-config-operator/blob/master/docs/FAQ.md#q-can-i-use-the-mco-to-re-partition-or-re-install- - Customer from a support case (linked to this RFE) is requesting to reach this using `storage.disk` section using a custom MachineConfig under a new MachineConfigPool. - Then OCP should serve a custom ignition file containing the new partitioning model for this newly provisioned node that will belong to that custom MCP. In other words, new provisioned nodes should consume a custom ignition defined via MCO with a custom partitioning

3. Why does the customer need this? (List the business requirements here)

4. List any affected packages or components.

• MCO
• Ignition
• RHCOS partitioning

5 Similar tickets:
https://issues.redhat.com/browse/CNF-11808