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Re: [Qemu-block] [Qemu-devel] [RFC PATCH V4] qemu-img: make convert asyn


From: Vladimir Sementsov-Ogievskiy
Subject: Re: [Qemu-block] [Qemu-devel] [RFC PATCH V4] qemu-img: make convert async
Date: Thu, 7 Jun 2018 13:19:29 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0

07.06.2018 13:10, Stefan Hajnoczi wrote:
On Fri, Jun 01, 2018 at 07:16:14PM +0300, Vladimir Sementsov-Ogievskiy wrote:
20.02.2017 17:59, Peter Lieven wrote:
Am 20.02.2017 um 15:50 schrieb Stefan Hajnoczi:
On Fri, Feb 17, 2017 at 05:00:24PM +0100, Peter Lieven wrote:
this is something I have been thinking about for almost 2 years now.
we heavily have the following two use cases when using qemu-img
convert.


[...]

Does this patch work with compressed images?  Especially the
out-of-order write mode may be problematic with a compressed qcow2
image.
It does, but you are right, out-of-order writes and compression should
be mutually exclusive.

Sorry for being late, but can you please explain to me, why?
There are image format-specific limitations on compressed writes.  For
some reason I thought they were append-only in qcow2, but I was wrong.

Stefan

And what are limitations for compressed writes in qcow2? We can't write asynchronously? Why?

--
Best regards,
Vladimir




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