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(No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 9823E3082126; Mon, 22 Jul 2019 17:21:08 +0000 (UTC) Received: from [10.18.17.145] (dhcp-17-145.bos.redhat.com [10.18.17.145]) by smtp.corp.redhat.com (Postfix) with ESMTP id C96EC10021B2; Mon, 22 Jul 2019 17:21:02 +0000 (UTC) To: =?UTF-8?Q?Fabian_Gr=c3=bcnbichler?= References: <20190709232550.10724-1-jsnow@redhat.com> <20190722121755.xpx2qni53e6pha7t@nora.maurer-it.com> From: John Snow Openpgp: preference=signencrypt Autocrypt: addr=jsnow@redhat.com; prefer-encrypt=mutual; keydata= mQINBFTKefwBEAChvwqYC6saTzawbih87LqBYq0d5A8jXYXaiFMV/EvMSDqqY4EY6whXliNO IYzhgrPEe7ZmPxbCSe4iMykjhwMh5byIHDoPGDU+FsQty2KXuoxto+ZdrP9gymAgmyqdk3aV vzzmCa3cOppcqKvA0Kqr10UeX/z4OMVV390V+DVWUvzXpda45/Sxup57pk+hyY52wxxjIqef rj8u5BN93s5uCVTus0oiVA6W+iXYzTvVDStMFVqnTxSxlpZoH5RGKvmoWV3uutByQyBPHW2U 1Y6n6iEZ9MlP3hcDqlo0S8jeP03HaD4gOqCuqLceWF5+2WyHzNfylpNMFVi+Hp0H/nSDtCvQ 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, List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Fam Zheng , vsementsov@virtuozzo.com, qemu-block@nongnu.org, Juan Quintela , Wen Congyang , Xie Changlong , qemu-devel@nongnu.org, "Dr. David Alan Gilbert" , Stefan Hajnoczi , Max Reitz , Markus Armbruster Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 7/22/19 8:17 AM, Fabian Gr=C3=BCnbichler wrote: > On Tue, Jul 09, 2019 at 07:25:32PM -0400, John Snow wrote: >> This series adds a new "BITMAP" sync mode that is meant to replace the >> existing "INCREMENTAL" sync mode. >> >> This mode can have its behavior modified by issuing any of three bitma= p sync >> modes, passed as arguments to the job. >> >> The three bitmap sync modes are: >> - ON-SUCCESS: This is an alias for the old incremental mode. The bitma= p is >> conditionally synchronized based on the return code of t= he job >> upon completion. >> - NEVER: This is, effectively, the differential backup mode. It never = clears >> the bitmap, as the name suggests. >> - ALWAYS: Here is the new, exciting thing. The bitmap is always synchr= onized, >> even on failure. On success, this is identical to incrementa= l, but >> on failure it clears only the bits that were copied successf= ully. >> This can be used to "resume" incremental backups from later = points >> in times. >> >> I wrote this series by accident on my way to implement incremental mod= e >> for mirror, but this happened first -- the problem is that Mirror mode >> uses its existing modes in a very particular way; and this was the bes= t >> way to add bitmap support into the mirror job properly. >> >> [...] >> >> Future work: >> [..] >> - Add these modes to Mirror. (Done*, but needs tests.) >=20 > are these mirror patches available somehwere for testing in combination > with this series? your bitmaps branch does not seem to contain them ;) >=20 > we've been experimenting with Ma Haocong's patch (v4 from February) to = add > "incremental"/differential sync to drive-mirror recently with positive > results so far, and this sounds like it is another attempt at getting > this properly integrated into Qemu. >=20 Not available quite yet; I added it in fairly hastily but haven't done the testing I want to do yet, so I wouldn't feel comfortable sharing it before I do my own due diligence on it. Give me a chance to polish it so that the testing effort isn't wasted :) Can you share some of your use-cases for how you are using the "incremental mirror" so far? It might be useful for the patch justification if I can point to production use cases. (And good for allocating time, too.) --js