[pve-devel] consistent backups / snapshots

[Stefan Priebe - Profihost AG]

Am 22.11.2012 15:12, schrieb Alexandre DERUMIER:
> Am 22.11.2012 14:41, schrieb Alexandre DERUMIER:
>> I see 2 ways :
>>
>> - snapshot with vmstate. (so pending write in memory are saved).
>
>>> Does this work with rbd snap?
>
> Yes. (Dietmar has implemented it with creating a rbd volume to store the vmstate).
> Just try with the proxmox gui ;)

I want to mount this exported disk elsewhere - so a memory copy does not 
help to me.

>> - implement qemu guest agent qmp protocol ,and send fs-freeze qmp command to freeze the filesystem, before doing the snapshot.
>> (I have seny some prelimary patches some months ago, need to be polish)
>
>>> Patches? this sounds experimental - patches for guest kernel? For qemu?
>
> patches for pve-qemu-server ;)
uh so you mean patches for qemu-server which enable qga? NICE ;-) will 
search the web.

> http://wiki.qemu.org/Features/QAPI/GuestAgent
>
> - First, you need to install qemu-ga deamon in your guest.
> - then pass
> -chardev qga_proxy,id=qga0 \
>   -device virtio-serial \
>   -device virtserialport,chardev=qga0,name=org.qemu.guest_agent.0
>   -qmp tcp:localhost:4444,server
>
> to kvm command line.
>
> and then implemented the qemu-ga protocol.
> (It's like qmp, but with some minor changes in protocol (check the wiki)

Stefan