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[Jonathan Rosser <1918292@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

I spent some time understanding how to rescue instances which are boot-
from-volume.

After finding a setup which would rescue instances properly with
hw_rescue_device=disk and hw_rescue_bus=usb, switching the rescue bus to
hw_rescue_bus=scsi resulted in an Ubuntu Focal instance to show "No
bootable device" in the instance console when trying to rescue it.

Switching the bus back to USB and unrescue/rescue worked as expected.

Here is the xml from the scsi bus rescue attempt
http://paste.openstack.org/show/803383/

Commands like this were used:  openstack server rescue --image
d0d00858-0672-4d19-9e5a-fb120d78c0fc 81057513-24cd-
49e7-b1e5-939d4080bb21 --os-compute-api-version 2.87

Environment
===========
1. Exact version of OpenStack you are running. 
   OpenStack Victoria, OpenStack-Ansible 22.0.0

2. Which hypervisor did you use?
   Libvirt + KVM. libvirt 6.0.0-0ubuntu8.5~cloud0
 
2. Which storage type did you use?
   All storage on Ceph

3. Which networking type did you use?
   Neutron with LinuxBridge

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1918292

Title:
  rescuing a boot from volume instance failed with "no bootable device"
  when hw_rescue_bus=scsi

Status in OpenStack Compute (nova):
  New

Bug description:
  I spent some time understanding how to rescue instances which are
  boot-from-volume.

  After finding a setup which would rescue instances properly with
  hw_rescue_device=disk and hw_rescue_bus=usb, switching the rescue bus
  to hw_rescue_bus=scsi resulted in an Ubuntu Focal instance to show "No
  bootable device" in the instance console when trying to rescue it.

  Switching the bus back to USB and unrescue/rescue worked as expected.

  Here is the xml from the scsi bus rescue attempt
  http://paste.openstack.org/show/803383/

  Commands like this were used:  openstack server rescue --image
  d0d00858-0672-4d19-9e5a-fb120d78c0fc 81057513-24cd-
  49e7-b1e5-939d4080bb21 --os-compute-api-version 2.87

  Environment
  ===========
  1. Exact version of OpenStack you are running. 
     OpenStack Victoria, OpenStack-Ansible 22.0.0

  2. Which hypervisor did you use?
     Libvirt + KVM. libvirt 6.0.0-0ubuntu8.5~cloud0
   
  2. Which storage type did you use?
     All storage on Ceph

  3. Which networking type did you use?
     Neutron with LinuxBridge

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