On 04/09/2018 04:11 AM, Kevin Wolf wrote: > Am 07.04.2018 um 00:16 hat Eric Blake geschrieben: >> Perhaps others have already known this, but I just realized that if you >> mix internal and external snapshots, you can set yourself up for massive >> failures when trying to use block-stream or block-commit to consolidate >> data across the external backing chain, without also thinking about the >> internal snapshots. > > Yeah, internal and external snapshots don't mix well. Basically, the > only thing that will work reliably is having a qcow2 image with internal > snapshots at the top, and then an immutable backing chain without > internal snapshots below it.
I may try to tackle some safety valve additions in 2.13; but as the problem is pre-existing and not a late regression in 2.12, it is not a candidate for rushing anything into -rc3. -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3266 Virtualization: qemu.org | libvirt.org
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