[libvirt-users] qemu-img snapshot on running virtual machine

[Gionatan Danti]

On 15/03/2018 16:49, Eric Blake wrote:
> 
> Yes, having two processes (in this case, the qemu process under 
> libvirt's control, and the qemu-img process) both trying to write to a 
> single qcow2 file at once is a recipe for disaster.  You are VERY likely 
> to cause irreparable disk corruption; although at least newer 
> qemu/qemu-io binaries now use file locking to at least fail up front 
> when they detect that another process has the image open for writing, 
> rather than letting you shoot yourself in the foot.
> 
> The only SAFE way to take a snapshot of a running virtual machine is 
> through commands issued to the qemu process that is running the machine 
> (that is, via libvirt APIs if libvirt is managing the qemu process).
> 

Roger :)
Thanks so much, Eric.

-- 
Danti Gionatan
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