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From Grégoire Lamodière <>
Subject RE: QEMU dirty-bitmap
Date Mon, 23 Apr 2018 13:11:22 GMT
Hi Paul, 

This is a very good news.
I am available for any work / help.


Grégoire Lamodière
T/ + 33 6 76 27 03 31
F/ + 33 1 75 43 89 71

-----Message d'origine-----
De : Paul Angus <> 
Envoyé : lundi 23 avril 2018 11:37
À :
Objet : RE: QEMU dirty-bitmap

Hi All,

Yes we will be implementing a 'generic' backup and recovery framework. We'll have the details
in the wiki, this week or next.
53 Chandos Place, Covent Garden, London  WC2N 4HSUK @shapeblue

-----Original Message-----
From: Grégoire Lamodière <>
Sent: 23 April 2018 09:52
Subject: RE: QEMU dirty-bitmap

Hi Simon, 

Thank you for your feedback.
I'll continue working on this.

In a more general perspective, this topic is related to backup process integrated into CS.
I remember an old thread (including @Paul I think) mentioning work on a backup API to give
third part companies' ability to include CS in their supported environments.
Even if this approach sounds the easiest for us, as service provider (ie buy a licence, make
2 clicks, and let the proprietary tool make the job), I am not sure this is the best long
term strategy, and so far, none of them support KVM.

Is there any interest of the community to integrate a backup solution inside CS ? 
For us, the key features would be :
- Add backup menu entry for admins
- Create backup tasks inside CS, including destinations (nfs) and sources (host, pool, zone)
- Support full, incremental, and forever incremental backups
- Ability to restore instances directly to CS
- If dirty-bitmaps work fine, include the move of the bitmap when moving instance to a different
- Support at least Xen and KVM

Right now, I think most of us use their own pieces of code.
Merging them into a proper feature would be a nice move.

We could also talk with the excellent XenOrchestra project (we use it for our Xen Pools) and
offer assistance to support KVM and other hypervisor, but I am not sure this is their strategy,
and with xenserver-ng, they might be quite busy.

Any opinion ?



Grégoire Lamodière
T/ + 33 6 76 27 03 31
F/ + 33 1 75 43 89 71

-----Message d'origine-----
De : Simon Weller <> Envoyé : dimanche 22 avril 2018 19:26
À : users <> Objet : Re: QEMU dirty-bitmap

That looks pretty interesting. I'll read up on it. We've been more focused lately on working
on Ceph replication, but this would be a nice way to handle it in a storage agnostic way.

- Si

From: Grégoire Lamodière <>
Sent: Sunday, April 22, 2018 7:15 AM
To: users
Subject: QEMU dirty-bitmap

Dear List,

Has anyone tried the dirty-bitmap solution to provide incremental backups on KVM/QEMU based
CS clusters ?
The solution sounds pretty nice, but instance migration scenarios need additional task to
copy the bitmaps.

Should we dig this subject and share, or is there any existing work on incremental backup
for CS / KVM (using qemu bitmaps or any other feature), that we might join ?



Grégoire Lamodière
T/ + 33 6 76 27 03 31
F/ + 33 1 75 43 89 71

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