[libvirt-users] Cannot create qcow2 images with libvirt 0.8.1
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> <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
Am Freitag, 28. Mai 2010 schrieb Guido Winkelmann:
If I leave out the <format> element and/or specify a <backingStore> element for the volume, it works again.
I have to correct myself: If I leave out the format element, there will be an image created and there will be no error message, but the resulting image has a capacity of 0 bytes. Regards Guido Winkelmann
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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Am Freitag, 28. Mai 2010 schrieb 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.
That solved it, thanks! Guido
participants (2)
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Cole Robinson -
Guido Winkelmann