Public bug reported:
QCOW2's created on Trusty (Qemu 1.7.0+dfsg-3ubuntu2) fail when
attempting any operation (read/mount/resize, etc) on Precise (1.0
+noroms-0ubuntu13).
This bug is affecting the cloud image build process for newer
architectures.
On 14.04
$ qemu-img create -o compat=0.10 -f qcow2 test.img 1G
Formatting 'test.img', fmt=qcow2 size=1073741824 compat='0.10' encryption=off
cluster_size=65536 lazy_refcounts=off
On 12.04
$ qemu-nbd -c /dev/nbd0 /tmp/test.img
'hda' uses a qcow2 feature which is not supported by this qemu version: QCOW
version 3
qemu-nbd: Failed to bdrv_open '/tmp/test.img': Operation not supported
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: qemu 1.7.0+dfsg-3ubuntu2
ProcVersionSignature: User Name 3.13.0-8.28-generic 3.13.2
Uname: Linux 3.13.0-8-generic x86_64
ApportVersion: 2.13.2-0ubuntu5
Architecture: amd64
Date: Thu Feb 20 15:58:39 2014
Ec2AMI: ami-00000778
Ec2AMIManifest: FIXME
Ec2AvailabilityZone: nova
Ec2InstanceType: cpu2-ram10-disk50-ephemeral20
Ec2Kernel: aki-00000548
Ec2Ramdisk: ari-00000548
SourcePackage: qemu
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: qemu (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug ec2-images trusty
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https://bugs.launchpad.net/bugs/1282655
Title:
qcow2 images are not backwards compatiable with 12.04's qcow2
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