On Tue, Dec 17, 2019 at 13:17:22 -0600, Eric Blake wrote: > On 12/17/19 12:35 PM, Peter Krempa wrote: > > Signed-off-by: Peter Krempa <pkrempa@xxxxxxxxxx> > > --- [...] > > +If the ``backing file format:`` field is missing above the format was not > > +specified properly. The image can be fixed by the following command: > > + > > +:: > > + > > + qemu-img rebase -f $IMAGE_FORMAT -F $BACKING_IMAGE_FORMAT -b $BACKING_IMAGE_PATH $IMAGE_PATH > > Adding -u can make this operation faster (blindly update the image metadata, > rather than actually crawling the entire image to perform a data operation > in the process). But I'm not sure whether we want to document that here. I thought qemu would skip the data verification if the backing image is not being changed. I'm not sure about the -u here though. > > +It is important to fill out ``$BACKING_IMAGE_FORMAT`` and ``$IMAGE_FORMAT`` > > +properly. ``$BACKING_IMAGE_PATH`` should be specified as a full absolute path. > > +If relative referencing of the backing image is desired, the path must be > > +relative to the location of image described by ``$IMAGE_PATH``. > > + > > +Missing images reported after after moving disk images into a different path > > +---------------------------------------------------------------------------- > > + > > +The path to the backing image which is recorded in the image metadata often > > +contains a full path to the backing image. This is the default libvirt-created > > +image configuration. When such images are moved to a different location the > > +top image will no longer point to the correct image. > > + > > +To fix such issue you can either fully specify the image chain in the domain XML > > +as pointed out above or the following ``qemu-img`` command can be used: > > + > > +:: > > + > > + qemu-img rebase -u -f $IMAGE_FORMAT -F $BACKING_IMAGE_FORMAT -b $BACKING_IMAGE_PATH $IMAGE_PATH > > + > > Odd to mention -u here but not above. Should we be consistent between the > two examples? You must use it here since qemu-img will fail to locate the old backing file as the example is fixing a image chain using absolute paths moved to a different location. -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list
