4:09 p.m.
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>
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>
*Cc:* vasily.lamykin(a)MegaFon.ru; Ovirt Users <users(a)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 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>:
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>:
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
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