[libvirt-users] status of copy-storage-all feature

[Eric Blake]

[please don't commandeer unrelated threads - when starting a new topic,
make sure you are NOT setting in-reply-to]

On 07/23/2013 06:33 AM, Thomas Stein wrote:
> Hello.
> 
> Can someone shed some light on the copy-storage-all feature? There are
> many hits on google. My current questions are.
> 
> 1. is it possible to do a migrate --live --copy-storage-all .... without
> shared storage?

Yes, that's the point of --copy-storage-all.

> 2. Do i need to have a preexisting image on the destination node?

I know there has been some work to get to the point of not having to
pre-create images on the destination, but am not sure of the current
state of that work.  Fastest might be to just try it and see; the error
message should be sane if it still isn't implemented.

> 3. Is this still true:
> 
> The current implementation of --copy-storage-all uses a qemu interface
> that upstream qemu developers are reluctant to support, and risks
> running into problems.  We have patches under review to use a new NBD
> server for migration when targeting qemu 1.4 with libvirt 1.0.2, with
> much less risk

What version of libvirt and qemu are you using?  Newer libvirt is indeed
able to use NBD migration for a much cleaner result.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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