Re: [Qemu-devel] [Qemu-block] block-stream/commit and mixing internal and external snapshots

[Eric Blake <eblake@redhat.com>]

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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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