On Sat, 2018-03-10 at 23:31 +0500, Roman Mamedov wrote:
> QCOW2 would add a second layer of COW
> on top of
> Btrfs, which sounds like a nightmare.

I've just seen there is even a nocow option "specifically" for btrfs...
it seems however that it doesn't disable the CoW of qcow, but rather
that of btrfs... (thus silently also the checksumming).

Does plain qcow2 really CoW on every write? I've always assumed it
would only CoW when one makes snapshots or so...

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