[libvirt-users] Cannot create qcow2 images with libvirt 0.8.1

[Cole Robinson]

On 05/28/2010 11:10 AM, Guido Winkelmann wrote:
> Hi,
> 
> After upgrading to libvirt 0.8.1, I can no longer create empty volumes with no 
> backing store and an explicit format of qcow2.
> 
> This XML volume definition:
> 
> <volume>
>   <name>testserverb-data2.img</name>
>   <allocation>0</allocation>
>   <capacity units='G'>20</capacity>

This should be 'unit', not 'units'. Libvirt is probably seeing that as
20 bytes, rounding down to 0K, and qemu-img isn't happy.

- Cole

>   <target>
>     <format type='qcow2'/>
>     <permissions>
>       <owner>107</owner>
>       <group>107</group>
>       <mode>0744</mode>
>     </permissions>
>   </target>
> </volume>
> 
> yields the error "Cannot run /usr/bin/qemu-img to create /data/testserverb-
> data.img: Invalid argument"
> 
> In /var/log/messages on the qemu host I can find the following snippet after 
> that:
> 
> error : virRunWithHook:933 : internal error '/usr/bin/qemu-img create -f qcow2 
> /data/testserverb-data.img 0K' exited with non-zero status 1 and signal 0: 
> qemu-img: Image creation needs a size parameter#012
> error : virStorageBackendCreateExecCommand:537 : Cannot run /usr/bin/qemu-img 
> to create /data/testserverb-data.img: Invalid argument
> error : qemudClientReadBuf:1653 : gnutls_record_recv: A TLS packet with 
> unexpected length was received.
> 
> If I leave out the <format> element and/or specify a <backingStore> element 
> for the volume, it works again. (I suppose the backing store makes it work 
> because in that case qemu-img does not need a size parameter...)
> 
> The host system is a vanilla Fedora Core 12 system (aside from the upgraded 
> libvirt).
> 
> Regards,
> 
> 	Guido Winkelmann
> 
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