RHEL8.4 + HPE DL360gen10: install ISO images boot very slowly or hang, access to DVD media via iLO driver is slow

Solution Unverified - Updated -

Issue

  • Booting the 8.4 DVD or boot ISO on a KVM guest works fine, but trying it on an HPE DL360Gen10 seems to hang or run extremely slowly
  • Everything worked fine with 8.3 but while 8.4 gets to the first (install, verify/install, troubleshoot) menu fine, it appears to take 2x - 10x longer to get to the GUI installer screen, if at all
    • Once at the GUI installer, things seem fine but have never gotten past about 20% of downloading packages

Environment

  • Red Hat Enterprise Linux (RHEL) 8.4
  • HPE DL360gen10
    • with iLO5 v2.44 and U32 v2.42 system firmware

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