[PVE-User] vzdump: how to backup server state

[Alain Péan]

Hi Holger,

You can only backup a file. You can imagine store the Ram content in a 
file (that is what is done with hiberfil.sys under windows), and backup 
that one, but it is not a frequent option. In fact, I never saw that for 
backup.

With LVM, you take a snapshot of the VM file system, and this frozen 
file system is backuped to another storage (NFS...).

For Live Migration, you have a central storage (iSCSI, FC, NFS, 
DRDB...), and you don't move the VM files, and indeed copy only the Ram 
and machine state to another machine, but it is not used for backup 
purpose, and I don't know if it is done in any virtualization solution 
(VMWare ?).

Regards,
Alain

Le 13/02/2012 13:21, Holger Ernst a écrit :
> But when you transfer a running machine to another cluster member there
> is a transfer of the current machine state too!
> So technically it should be possible to save ram content and cpu/machine
> state...
>
> Regards, Holger
>
> --------------
> Il 13/02/2012 09:40, Simone Ruffilli ha scritto:
>> Hi,
>> I'm running a 3-machines cluster of proxmox-1.9, primarily for KVM
>> virtualization.
>>
>> I would like hot backup the VMs, saving the machine state. Is that
> possible?
>
> If you're referring to Snapshot support in QEMU [1][2], when relying on
> QCOW2 storage format, it seems that it isn't directly supported by
> ProxMox.
> As for ProxMox, it seems that the "Snapshot" support is always related
> to
> the underlying LVM kernel support. As such, it cover "only" storage
> issues.
>
> At least, this is what I understood from a thread discussed last month
> on
> this very same list [3].
>
> Bye,
> DV
>
> [1] http://wiki.qemu.org/Features/Snapshots
> [2]
> https://events.linuxfoundation.org/slides/2011/linuxcon-japan/lcj2011_so
> rensen.pdf
> [3] http://pve.proxmox.com/pipermail/pve-user/2012-January/003024.html
>
> - -- 
> Damiano Verzulli
> e-mail: damiano at verzulli.it
> - ---
> possible?ok:while(!possible){open_mindedness++}
> - ---
> "Technical people tend to fall into two categories: Specialists
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> narrower and narrower field, until he eventually, in the limit,
> knows everything about nothing. The Generalist learns less and
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>
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Alain Péan - LPP/CNRS
Administrateur Système/Réseau
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