Hi, I'm running an OpenStack setup with Fibre Channel (FC) storage using Cinder volumes. I'm currently trying to configure a Windows Failover Cluster in guest VMs and have encountered an issue. Windows is querying the SCSI device for the Device Identification VPD (Page 0x83). The LUN is attached as a SCSI device using a virtio-scsi controller. In the domain XML (via libvirt), I see that the disk is defined as <disk type='block' device='disk'> also has a <serial>cinder-vol-uuid</serial> When Page 0x83 is queried, it returns the serial value (i.e., the cinder-vol-uuid), which Windows fails to recognize or accept. However, if I modify the XML to use: <disk type='block' device='lun'> and remove the <serial> tag, the guest is able to retrieve the expected information (I had to stop the compute service and restart the libvirt domain). Unfortunately, any changes made directly to the domain XML do not persist. Is there a supported way to specify device='lun' instead of device='disk' for volumes attached ? Any guidance would be greatly appreciated. Thank you With Best regards, Janaka