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Date: Wed, 10 Jun 2015 18:04:02 +0200 (CEST)
From: Alexandre DERUMIER <aderumier@odiso.com>
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Subject: Re: [Qemu-devel] [PATCH 1/2] qapi: Add "detect-zeroes" option
	to	drive-mirror
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To: Andrey Korolyov <andrey@xdel.ru>
Cc: Kevin Wolf <kwolf@redhat.com>, Fam Zheng <famz@redhat.com>, qemu block <qemu-block@nongnu.org>, Jeff Cody <jcody@redhat.com>, qemu-devel <qemu-devel@nongnu.org>, Markus Armbruster <armbru@redhat.com>, stefanha <stefanha@redhat.com>, pbonzini <pbonzini@redhat.com>

>>Sorry, forgot to mention - of course I`ve pulled all previous=20
>>zeroing-related queue, so I haven`t had only the QMP-related fix=20
>>running on top of the master :)=20

Hi, I had a discussion about rbd mirroring, detect-zeroes and sparse target=
,  some months ago with paolo

http://qemu.11.n7.nabble.com/qemu-drive-mirror-to-rbd-storage-no-sparse-rbd=
-image-td293642.html

Not sure it's related but=20

"Lack of bdrv_co_write_zeroes is why detect-zeroes does not work.=20

Lack of bdrv_get_block_status is why sparse->sparse does not work=20
without detect-zeroes.=20

Paolo=20
"
----- Mail original -----
De: "Andrey Korolyov" <andrey@xdel.ru>
=C3=80: "Fam Zheng" <famz@redhat.com>
Cc: "Kevin Wolf" <kwolf@redhat.com>, "qemu block" <qemu-block@nongnu.org>, =
"Jeff Cody" <jcody@redhat.com>, "qemu-devel" <qemu-devel@nongnu.org>, "Mark=
us Armbruster" <armbru@redhat.com>, "stefanha" <stefanha@redhat.com>, "pbon=
zini" <pbonzini@redhat.com>
Envoy=C3=A9: Mercredi 10 Juin 2015 17:48:54
Objet: Re: [Qemu-devel] [PATCH 1/2] qapi: Add "detect-zeroes" option to=09d=
rive-mirror

> '{"execute":"drive-mirror", "arguments": { "device":=20
> "drive-virtio-disk0", "target":=20
> "rbd:dev-rack2/vm33090-dest:id=3Dqemukvm:key=3Dxxx:auth_supported=3Dcephx=
\\;none:mon_host=3D10.6.0.1\\:6789\\;10.6.0.3\\:6789\\;10.6.0.4\\:6789",=20
> "mode": "existing", "sync": "full", "detect-zeroes": true, "format":=20
> "raw" } }'=20

Sorry, forgot to mention - of course I`ve pulled all previous=20
zeroing-related queue, so I haven`t had only the QMP-related fix=20
running on top of the master :)=20