Hi, I'm trying to install openstack Ussuri on Centos 8 hardware using tripleo. I'm using a relatively old hardware (dell PowerEdge R620) with old RAID controllers, deprecated in RHEL8/Centos8. Here is some basic information:

# lspci | grep -i raid
00:1f.2 RAID bus controller: Intel Corporation C600/X79 series chipset SATA RAID Controller (rev 05)
02:00.0 RAID bus controller: Broadcom / LSI MegaRAID SAS 2008 [Falcon] (rev 03)

I'm able to manually install centos 8 using DUD driver from here -> https://elrepo.org/linux/dud/el8/x86_64/dd-megaraid_sas-07.710.50.00-1.el8_2.elrepo.iso  (basically I add inst.dd and I use an usb pendrive with iso).

Is there a way to do bare metal provisioning using openstack on this kind of server? At the moment, when I launch "openstack overcloud node introspect --provide controller1" it doesn't recognize disks (local_gb = 0 in properties) and in inspector logs I see:

Jun 22 11:12:42 localhost.localdomain ironic-python-agent[1543]: 2018-06-22 11:12:42.261 1543 DEBUG root [-] Still waiting for the root device to appear, attempt 1 of 10 wait_for_disks /usr/lib/python3.6/site-packages/ironic_python_agent/hardware.py:652
Jun 22 11:12:45 localhost.localdomain ironic-python-agent[1543]: 2018-06-22 11:12:45.299 1543 DEBUG oslo_concurrency.processutils [-] Running cmd (subprocess): udevadm settle execute /usr/lib/python3.6/site-packages/oslo_concurrency/processutils.py:372
Jun 22 11:12:45 localhost.localdomain ironic-python-agent[1543]: 2018-06-22 11:12:45.357 1543 DEBUG oslo_concurrency.processutils [-] CMD "udevadm settle" returned: 0 in 0.058s execute /usr/lib/python3.6/site-packages/oslo_concurrency/processutils.py:409
Jun 22 11:12:45 localhost.localdomain ironic-python-agent[1543]: 2018-06-22 11:12:45.392 1543 DEBUG ironic_lib.utils [-] Execution completed, command line is "udevadm settle" execute /usr/lib/python3.6/site-packages/ironic_lib/utils.py:101
Jun 22 11:12:45 localhost.localdomain ironic-python-agent[1543]: 2018-06-22 11:12:45.426 1543 DEBUG ironic_lib.utils [-] Command stdout is: "" execute /usr/lib/python3.6/site-packages/ironic_lib/utils.py:103
Jun 22 11:12:45 localhost.localdomain ironic-python-agent[1543]: 2018-06-22 11:12:45.460 1543 DEBUG ironic_lib.utils [-] Command stderr is: "" execute /usr/lib/python3.6/site-packages/ironic_lib/utils.py:104
Jun 22 11:12:45 localhost.localdomain ironic-python-agent[1543]: 2018-06-22 11:12:45.496 1543 WARNING root [-] Path /dev/disk/by-path is inaccessible, /dev/disk/by-path/* version of block device name is unavailable Cause: [Errno 2] No such file or directory: '/dev/disk/by-path': FileNotFoundError: [Errno 2] No such file or directory: '/dev/disk/by-path'
Jun 22 11:12:45 localhost.localdomain ironic-python-agent[1543]: 2018-06-22 11:12:45.549 1543 DEBUG oslo_concurrency.processutils [-] Running cmd (subprocess): lsblk -Pbia -oKNAME,MODEL,SIZE,ROTA,TYPE execute /usr/lib/python3.6/site-packages/oslo_concurrency/processutils.py:372
Jun 22 11:12:45 localhost.localdomain ironic-python-agent[1543]: 2018-06-22 11:12:45.647 1543 DEBUG oslo_concurrency.processutils [-] CMD "lsblk -Pbia -oKNAME,MODEL,SIZE,ROTA,TYPE" returned: 0 in 0.097s execute /usr/lib/python3.6/site-packages/oslo_concurrency/processutils.py:409
Jun 22 11:12:45 localhost.localdomain ironic-python-agent[1543]: 2018-06-22 11:12:45.683 1543 DEBUG ironic_lib.utils [-] Execution completed, command line is "lsblk -Pbia -oKNAME,MODEL,SIZE,ROTA,TYPE" execute /usr/lib/python3.6/site-packages/ironic_lib/utils.py:101
Jun 22 11:12:45 localhost.localdomain ironic-python-agent[1543]: 2018-06-22 11:12:45.719 1543 DEBUG ironic_lib.utils [-] Command stdout is: "" execute /usr/lib/python3.6/site-packages/ironic_lib/utils.py:103
Jun 22 11:12:45 localhost.localdomain ironic-python-agent[1543]: 2018-06-22 11:12:45.755 1543 DEBUG ironic_lib.utils [-] Command stderr is: "" execute /usr/lib/python3.6/site-packages/ironic_lib/utils.py:104

Is there a way to solve the issue? For example, can I modify ramdisk and include DUD driver? I tried this guide: https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/16.0/html/partner_integration/overcloud_images#initrd_modifying_the_initial_ramdisks 

but I don't know how to include an ISO instead of an rpm packet as described in the example.

Thank you,

Marco