Public bug reported:
Since Ubuntu 24.04, it is no longer possible to query the I/O throttle
parameters of an image using Virsh. The issue occurs at least with
libvirt-daemon version 10.0.0-2ubuntu8.4. The following error message
appears:
# virsh blkdeviotune test_vm sda
error: Unable to get number of block I/O throttle parameters
error: An error occurred, but the cause is unknown
How to reproduce:
- Create a VM
- Query the I/O throttle parameters of the image attached to the VM using Virsh
- The error appears
The expected output should be:
# virsh blkdeviotune test_vm sda
total_bytes_sec: 0
read_bytes_sec : 0
write_bytes_sec: 0
total_iops_sec : 0
read_iops_sec : 0
write_iops_sec : 0
total_bytes_sec_max: 0
read_bytes_sec_max: 0
write_bytes_sec_max: 0
total_iops_sec_max: 0
read_iops_sec_max: 0
write_iops_sec_max: 0
size_iops_sec : 0
group_name : scsi0-0-0-0
total_bytes_sec_max_length: 0
read_bytes_sec_max_length: 0
write_bytes_sec_max_length: 0
total_iops_sec_max_length: 0
read_iops_sec_max_length: 0
write_iops_sec_max_length: 0
To be sure, I also compiled and tested the latest libvirt version from
source, and the issue did not occur there. I also tested it on a Rocky
Linux environment with the version shipped there (also version 10.0.0),
and the problem did not occur either. This suggests that the issue is
specific to the Ubuntu package.
I also tried running the virsh command with LIBVIRT_DEBUG=1 to check for
a clearer message, but I couldn’t gather much from it.
Information about the system:
- Ubuntu 24.04.1 LTS
- libvirt-daemon 10.0.0-2ubuntu8.4
- virsh --version: 10.0.0
- 6.8.0-31-generic #31-Ubuntu
** Affects: libvirt (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2084136
Title:
Unable to get number of block I/O throttle parameters
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