On 13 November 2017 at 17:14, Peter Maydell <peter.mayd...@linaro.org> wrote: > I have a qcow v1 file which I created by mistake (forgetting that > you need to tell qemu-img create 'qcow2' and not just 'qcow'), > which I want to convert to a v2 file so I can put snapshots into > it. But when I try to do this with qemu-img convert it creates a > v3 file instead: > > $ file hda-old.qcow > hda-old.qcow: QEMU QCOW Image (v1), 5368709120 bytes > $ build/x86/qemu-img convert -O qcow2 hda-old.qcow hda.qcow2 > $ file hda.qcow2 > hda.qcow2: QEMU QCOW Image (v3), 5368709120 bytes > > and if you then try to use that in QEMU it complains: > > qemu-system-aarch64: -drive if=none,file=hda.qcow2,format=qcow,id=hd: > Unsupported qcow version 3
ah, this means it wants "format=qcow2". This is pretty confusing, especially the error message, the output of "file", and the fact that "format=qcow" can't just DTRT if it gets a qcow version 3 (2?), since it can clearly identify what it's got. thanks -- PMM
