On 27.08.19 04:39, lampahome wrote: > It won’t do so by reading any clusters. It just checks metadata to see > which clusters are allocated above the base image, and then writes those > to the base. > > So conclusion below: > > Non-similarity: > qemu-img commit: only commit allocated clusters to base images. > qemu-img rebase: compare each cluster if they're the same before > committing. Commit cluster if difference. > > Do I misunderstand?
Well, rebase doesn’t commit. It pulls the changes up to the overlay. Also, as John has written, it should be noted rebase is also a more versatile and general tool than commit. (Hence its name, it allows rebasing onto any backing file; whereas commit only works with the backing chain as-is.) Max
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