Re: [Qemu-discuss] Live VM backup

[Vincenzo Romano]

Il 30 ago 2017 05:19, "Fam Zheng" <address@hidden> ha scritto:

On Tue, 08/29 18:32, Vincenzo Romano wrote:
> I'd like to move away from "another virtualization solution" to QEmu.
> I've more or less all the needed bits in my hands in order to define,
> run and manage QEmu VMs.
> What I am missing is the knowledge of how to backup a live VM.
> Of course, if I shutdown the VM, I can simply copy its files and the
> startup script on another QEmu host.
> But my main objective is to do the backup while the VM is running.
> I think I could use the snapshot feature, but have no idea on how to
proceed.
> Any hint?

In short, just do what libvirt would do: use QMP and send 'drive-backup'
command.

This is a very good howto:

https://github.com/qemu/qemu/blob/master/docs/interop/live-b
lock-operations.rst

Fam


Thanks.
I presume there's a 'drive-restore', though I need to look better in the
docs.

Is there any side effect in case the CPU where the VM will be restored is
not exactly the same as the one where the VM got backed up?