Re: [Qemu-block] [Qemu-devel] Persistent bitmaps for non-qcow2 formats

[Fam Zheng]

On Fri, 08/25 15:44, Max Reitz wrote:
> Well, OK.  The main argument against supporting anything but qcow2 is
> "if you want features, use qcow2; and we are working on making qcow2 as
> fast as possible."  I think that's a very good argument still.  At some
> point I (and probably others, too) had the idea of making qcow2 files in
> raw layout: 


Yes! I think this idea makes a whole lot of sense, too. Metadata tables can be
generated so old implementation can still use it.

Fam

> Have the data as a blob, just like a raw file, padded by
> metadata around it.  An autoclear flag would specify that the qcow2 file
> is in this format, and if so, you could simply access it like a raw file
> and should have exactly the same speed as a raw file.  Maybe that would
> solve this whole issue, too?