On 11/05/2014 09:38 AM, Max Reitz wrote: >> Note that specifying just the top image's format is not enough, you also >> have to specify any backing images' formats. QCOW2 can optionally store >> the backing image format in the image. The other COW formats can't. > > Well, they can, with "json:". *cough* > >> Example of insecure usage: -hda bar.vmdk, where bar.vmdk is a VMDK image >> with a raw backing file. > > Yesterday I found out that doesn't seem possible. You apparently can > only use VMDK with VMDK backing files. Other than that, we only have > qcow1 and qed as COW formats which should not be used anyway.
Actually, qed requires the backing format to be recorded (it is non-optional) and is therefore immune to probing problems of backing files. That's one thing it got right. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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