Tested on s390x to also check if this is cross arch - trying to recreate as reported.
Jammy 8.0 Noble 10.0 Noble 10.6 backport Oracular 10.6 As guest I was using jammy, naming is j (jammy) -on- $release. They all are created with uvtool, like r=jammy; uvt-simplestreams-libvirt --verbose sync --source http://cloud-images.ubuntu.com/daily arch=s390x label=daily release=${r} uvt-kvm create --password=ubuntu --ssh-public-key-file /home/ubuntu/.ssh/authorized_keys j-on-j release=${r] arch=s390x label=daily That by default has only virtio disks virsh domblklist j-on-j Target Source --------------------------------------------------------- vda /var/lib/uvtool/libvirt/images/j-on-j.qcow vdb /var/lib/uvtool/libvirt/images/j-on-j-ds.qcow <disk type='file' device='disk'> <driver name='qemu' type='qcow2'/> <source file='/var/lib/uvtool/libvirt/images/j-on-j.qcow' index='2'/> <backingStore type='file' index='3'> <format type='qcow2'/> <source file='/var/lib/uvtool/libvirt/images/x-uvt-b64-Y29tLnVidW50dS5jbG91ZC5kYWlseTpzZXJ2ZXI6MjIuMDQ6czM5MHggMjAyNDEwMDQ='/> <backingStore/> </backingStore> <target dev='vda' bus='virtio'/> <alias name='virtio-disk0'/> <address type='ccw' cssid='0xfe' ssid='0x0' devno='0x0000'/> </disk> This is intentionally (for the mentioned cross check) quite different - virtio instead of the assumed scsi or ide you have behind sda - ccw bus connection - architecture And gladly still I can reproduce it root@j-lp2084136:~# virsh blkdeviotune j-on-j vda total_bytes_sec: 0 ... root@n-lp2084136:~# virsh blkdeviotune j-on-n vda error: Unable to get number of block I/O throttle parameters error: An error occurred, but the cause is unknown root@o-lp2084136:~# virsh blkdeviotune j-on-o vda total_bytes_sec: 0 ... Noble upgraded to the 10.6 backport 10.6.0-1ubuntu3~backport24.04.202410200032~ubuntu24.04.1 root@n-lp2084136:~# virsh blkdeviotune j-on-n vda total_bytes_sec: 0 ... So confirming all that Jeffrey reported, the issue seems to be pretty generic in regard to disk types and can easily be reproduced. ** Changed in: libvirt (Ubuntu) Status: Confirmed => Triaged -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2084136 Title: Unable to get number of block I/O throttle parameters To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/2084136/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
