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
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Von: Yaniv Dary [mailto:ydary@redhat.com]
Gesendet: Dienstag, 27. September 2016 15:10
An: Sven Achtelik <Sven.Achtelik@mailpool.us>
Cc: Maton, Brett <matonb@ltresources.co.uk>; vasily.lamykin@MegaFon.ru; Ovirt Users <users@ovirt.org>
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?
Yaniv DaryTechnical Product ManagerRed Hat Israel Ltd.34 Jerusalem RoadBuilding A, 4th floorRa'anana, Israel 4350109Tel : +972 (9) 76923068272306Email: ydary@redhat.comIRC : ydary
On Tue, Sep 27, 2016 at 4:01 PM, Sven Achtelik <Sven.Achtelik@mailpool.us> 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,
Von: users-bounces@ovirt.org [mailto:users-bounces@ovirt.
org ] Im Auftrag von Yaniv Dary
Gesendet: Dienstag, 27. September 2016 14:38
An: Maton, Brett <matonb@ltresources.co.uk>
Cc: vasily.lamykin@MegaFon.ru; Ovirt Users <users@ovirt.org>
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 DaryTechnical Product ManagerRed Hat Israel Ltd.34 Jerusalem RoadBuilding A, 4th floorRa'anana, Israel 4350109Tel : +972 (9) 76923068272306Email: ydary@redhat.comIRC : ydary
2016-09-27 15:27 GMT+03:00 Maton, Brett <matonb@ltresources.co.uk>:
Is there a preferred or recommended backup method in the meantime ?
2016-09-22 10:30 GMT+01:00 vasily.lamykin@MegaFon.ru <vasily.lamykin@megafon.ru>:
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
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