There is a following document describing how to specify storage devices to be used for Swift:

https://docs.redhat.com/en/documentation/red_hat_openstack_platform/17.1/html/configuring_persistent_storage/assembly_swift-configuring-the-object-storage-service_cinder-advanced#proc_using-external-san-disks_swift-customizing-the-object-storage-service

parameter_defaults:
  SwiftRawDisks: {"sdb": {}, "sdc": {}}

However, in RHEL 9, /dev/sdX name may differ between overcloud nodes even if hardware configuration is completely the same.
So, the above setting may not work well. Deployments may fail.

Instead of the above document, we should follow the article below in RHOSP 17 and RHEL 9:

• https://access.redhat.com/articles/7048606

But it is a bit difficult for customers to find out the above article.
I think the document should have a link to the article, or we should replace the content of the document with the content of the article.