libvirt users - Nov 2012 - error: unsupported configuration: block I/O throttling not supported with this QEMU binary

Hi, guys.

I want to change block I/O throttle using 'virsh blkdeviotune' with vm
not running, it reported an error:

# virsh blkdeviotune instance-000000dc /dev/loop0 --total-bytes-sec 20000000
--total-iops-sec 20 --config
error: Unable to change block I/O throttle
error: unsupported configuration: block I/O throttling not supported with this
QEMU binary

I can do this when the vm is running. Is it a bug? How can I fix this problem.

BTW,My libvirt version is 0.9.13:
# virsh version
Compiled against library: libvir 0.9.13
Using library: libvir 0.9.13
Using API: QEMU 0.9.13
Running hypervisor: QEMU 1.1.2

Thanks.
2012-11-28



hzguanqiang
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On 2012?11?28? 16:34, hzguanqiang wrote:
> Hi, guys.
> I want to change block I/O throttle using 'virsh blkdeviotune' with
vm
> not running, it reported an error:
> # virsh blkdeviotune instance-000000dc /dev/loop0 --total-bytes-sec
> 20000000 --total-iops-sec 20 --config
> error: Unable to change block I/O throttle
> error: unsupported configuration: block I/O throttling not supported
> with this QEMU binary
> I can do this when the vm is running. Is it a bug? How can I fix this
> problem.
It just looks strange, as you can tune when the VM is active. Because
the qemu capabilities is collected during the qemu driver starts up,
which is independant with the domain states.

Probably you will want to debug the qemu capabilities collecting
process.

Osier