RHCOS support for iSCSI boot volumes

Proposed title of this feature request

RHCOS support for iSCSI boot volumes

What is the nature and description of the request?

RHCOS currently does not support iSCSI boot volumes except when it's via an HBA that makes it appear as a regular local disk.  On Oracle Cloud Infrastructure (OCI), their standard bare metal shapes (for OCI with baremetal and Oracle Cloud VMware Solutions) use iSCSI for their boot volumes.

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

In OCI, the “Standard” family shapes (instance types in OCI lingo) are the most affordable and most popular OCI baremetal configurations, and they do not have any local storage and the boot volume is ICSCI based.  Oracle has since mentioned that standard shapes are the most commonly used shapes for OCI baremetal.

Oracle mentions they did not have such problems with RHEL, but have hit the issue where RHCOS boot configuration is different. Some of the OCI GPU shapes also do not have local storage.

The inability to use OCI baremetal standard shapes with OpenShift will likely be a major problem (and major blocker) for many customers looking to run OpenShift on OCI with baremetal.

List any affected packages or components.

RHCOS