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 > > _______________________________________________ > libvirt-users mailing list > libvirt-users@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/libvirt-users
