Logical Disk Name Not Displayed

[henrys7]

• Problem
  • Logical name of disk isn't displayed after detaching and attaching that to VM.
  • I guess it occurs when disk operations (detach & attach) happen within the DiskMapping notification cycle of the guest agent. As a result, the DiskMapping hash remains the same and the logical name is not updated.
    • ref link: https://github.com/oVirt/vdsm/blob/ovirt-4.3/lib/vdsm/virt/vm.py#L2020
    • DiskMapping hash is based on disk serial and disk name in guest
• Version Information
  • Guest Information
    • OS: RHEL 7.6
    • Guest Agent:
      • ovirt-guest-agent-common-1.0.16-1.el7ev
      • qemu-guest-agent-2.12.0
    • but, it appears to be reproducible regardless of the guest OS and agent.
  • VDSM
    • vdsm-4.30.51-1.el7ev
    • but, it's likely that latest version has the same issue as related logic still remains
• How reproducible:80%
• Steps to Reproduce:
  • 1.hot-unplug a disk of a VM
  • 2.hot-plug the same disk to the VM again "quickly" (within approximately 5 seconds)
• Actual results:
  • On admin portal, logical name of the disk isn't displayed
  • Also, DB data related to it is null (logical_name column in vm_device table)
• Expected results:
  • the logical name of the disk is displayed
• or any idea like restarting some daemons to display name without affecting the VM?