Re: [ovirt-users] VM incremental backup

Hi all, I didn't know this tool, after testing the original 40GB image size is reduced as expected to 2,9GB with du -sh, but transfer between servers continue to act as a 40GB image. So if I understand virt-sparsify reduces the effective space on the local disk, but the disk is seen with its original size by other systems, and there is no advantage in transferring the image from one server to an other. Please tell me if I'm wrong. Le 29/09/2016 à 15:10, Kai Wagner a écrit : Hey, I don't wont to break into your discussion, but I also never heard about virt-sparsfiy and the sparse option for dd. I tested it and it works like a charm. I converted a block device 65GB with dd sparse to 40GB raw image and afterwards I used virsh-sparsify to reduce the size down to 6.8GB into a qcow2 image file. Thanks a lot for that hint. Kai Am 27.09.2016 um 15:17 schrieb Sven Achtelik: No, I never came across this approach. I didn’t know about virt-sparsify. I’ll look into that and give it a try. Thank you it-novum GmbH i. A. Kai Wagner ● Team Lead Support & Presales openATTIC _____________________________________________________________ Unser Newsletter Service: Jetzt Business Open Source News abonnieren! <http://www.it-novum.com/newsletter?wm=mail> <http://www.it-novum.com/newsletter?wm=mail> Folgen Sie uns: <http://www.it-novum.com/blog/?wm=mail> <http://www.it-novum.com/blog/feed?wm=mail> <https://twitter.com/itnovum> <http://www.xing.com/companies/itnovumgmbh/about> <http://www.linkedin.com/company/it-novum-gmbh> <https://plus.google.com/105835582713486693501> <http://www.youtube.com/user/itnovumGmbH?sub_confirmation=1%20> <https://www.facebook.com/itnovum> <http://www.it-novum.com/?wm=mail> Tel: +49 661 103-762 Fax: +49 661 10317762 Mail: Kai.Wagner(a)it-novum.com it-novum GmbH • Edelzeller Straße 44 • 36043 Fulda • http://www.it-novum.com/ Handelsregister Amtsgericht Fulda, HRB 1934 • Geschäftsführer: Michael Kienle • Sitz der Gesellschaft: Fulda Der Inhalt dieser E-Mail ist vertraulich. Wenn Sie nicht der eigentliche Empfänger sein sollten, informieren Sie bitte sofort den Absender oder vernichten umgehend diese Mail. Jegliche unerlaubte Vervielfältigung oder Weiterleitung dieser Mail ist strengstens verboten. This e-mail may contain confidential and/or priviledged information. If you are not the intended recepient (or have received this e-mail in error) please notify the sender immediately and destroy this e-mail. Any unauthorised copying, disclosure or distribution of material in this e-mail is strictly forbidden. *Von:* Yaniv Dary [mailto:ydary@redhat.com <ydary(a)redhat.com>] *Gesendet:* Dienstag, 27. September 2016 15:10 *An:* Sven Achtelik <Sven.Achtelik(a)mailpool.us&gt; <Sven.Achtelik(a)mailpool.us&gt; *Cc:* Maton, Brett <matonb(a)ltresources.co.uk&gt; <matonb(a)ltresources.co.uk>; vasily.lamykin(a)MegaFon.ru; Ovirt Users <users(a)ovirt.org&gt; <users(a)ovirt.org&gt; *Betreff:* Re: [ovirt-users] VM incremental backup As I see it you have two options: - In backup use 'dd' with 'conv=sparse' (or similar tool that allows sparse). - After backup use virt-sparsify [1] to reduce the size to the real used size prior to restore. To make this extra efficient you can use virt-sparsify anyways after backup to make the file even smaller. Have you considered this approach? [1] http://libguestfs.org/virt-sparsify.1.html Yaniv Dary Technical Product Manager Red Hat Israel Ltd. 34 Jerusalem Road Building A, 4th floor Ra'anana, Israel 4350109 Tel : +972 (9) 7692306 8272306 Email: ydary(a)redhat.com IRC : ydary On Tue, Sep 27, 2016 at 4:01 PM, Sven Achtelik <Sven.Achtelik(a)mailpool.us&gt; wrote: Hi Yaniv, how can this be done with DD ? Since it doesn’t know if the block is free space ? I’ve been looking for such a solution for a long time now. Everything I could find out was that I have to use a utility that understands the FS and therefore knows where the free space is. Thank you, Sven *Von:* users-bounces(a)ovirt.org [mailto:users-bounces@ovirt.org] *Im Auftrag von *Yaniv Dary *Gesendet:* Dienstag, 27. September 2016 14:38 *An:* Maton, Brett <matonb(a)ltresources.co.uk&gt; *Cc:* vasily.lamykin(a)MegaFon.ru; Ovirt Users <users(a)ovirt.org&gt; *Betreff:* Re: [ovirt-users] VM incremental backup Full VM disk backup. If you use dd you can drop the 0 parts of the disk. Yaniv Dary Technical Product Manager Red Hat Israel Ltd. 34 Jerusalem Road Building A, 4th floor Ra'anana, Israel 4350109 Tel : +972 (9) 7692306 8272306 Email: ydary(a)redhat.com IRC : ydary 2016-09-27 15:27 GMT+03:00 Maton, Brett <matonb(a)ltresources.co.uk&gt;: Is there a preferred or recommended backup method in the meantime ? 2016-09-22 10:30 GMT+01:00 vasily.lamykin(a)MegaFon.ru < vasily.lamykin(a)megafon.ru&gt;: Hello! I would like to understand the existence of the possibility of incremental VM backups. And if it is, the means by which it is achieved. While I was only able to achieve a complete backup of the virtual machine (but it is a very large amount of information and time) by cloning a snapshot of the VM and export to data domain. *Ламыкин Василий* Старший инженер по эксплуатации сервисных платформ Столичный ф-ал ПАО "МегаФон +7 (926) 500-3308 [image: МегаФон лого+знак РУС B2C] ------------------------------ Информация в этом сообщении предназначена исключительно для конкретных лиц, которым она адресована. В сообщении может содержаться конфиденциальная информация, которая не может быть раскрыта или использована кем-либо, кроме адресатов. Если вы не адресат этого сообщения, то использование, переадресация, копирование или распространение содержания сообщения или его части незаконно и запрещено. Если Вы получили это сообщение ошибочно, пожалуйста, незамедлительно сообщите отправителю об этом и удалите со всем содержимым само сообщение и любые возможные его копии и приложения. The information contained in this communication is intended solely for the use of the individual or entity to whom it is addressed and others authorized to receive it. It may contain confidential or legally privileged information. The contents may not be disclosed or used by anyone other than the addressee. If you are not the intended recipient(s), any use, disclosure, copying, distribution or any action taken or omitted to be taken in reliance on it is prohibited and may be unlawful. If you have received this communication in error please notify us immediately by responding to this email and then delete the e-mail and all attachments and any copies thereof. (c)20mf50 _______________________________________________ Users mailing list Users(a)ovirt.org http://lists.ovirt.org/mailman/listinfo/users _______________________________________________ Users mailing list Users(a)ovirt.org http://lists.ovirt.org/mailman/listinfo/users _______________________________________________ Users mailing listUsers@ovirt.orghttp://lists.ovirt.org/mailman/listinfo/users _______________________________________________ Users mailing listUsers@ovirt.orghttp://lists.ovirt.org/mailman/listinfo/users -- Nathanaël Blanchet Supervision réseau Pôle Infrastrutures Informatiques 227 avenue Professeur-Jean-Louis-Viala 34193 MONTPELLIER CEDEX 5 Tél. 33 (0)4 67 54 84 55 Fax 33 (0)4 67 54 84 14blanchet(a)abes.fr _______________________________________________ Users mailing list Users(a)ovirt.org http://lists.ovirt.org/mailman/listinfo/users