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Re: [Xen-devel] [xen-devel] Live migration with disk image

On Tue, Mar 5, 2013 at 4:16 AM, ææå <Arthur Chunqi Li> <yzt356@xxxxxxxxx> wrote:
> Hi all,
> I find an interesting thing which confused me for a long time. Until the
> latest version, live migration can only be used with remote storage such as
> NFS. I wonder why live migration with local VM image fails to be added to
> Xen in these years since live migration is supported for a very long time?
> Are there any technical or industrial concerns about it? If live migration
> can't be used with local image, it will be limited used in many clouds.

I think the big reason is that the core xen.org project focuses
primarily on cpu virtualization, and tends to leave the disk
management things to be handled in other layers (e.g., filesystem,
LVM, &c).  XenServer / XCP take a more product-view / holistic
approach, which is why they have implemented support for both
integrated storage management and storage migration.

That said, storage migration is on our radar -- we are waiting for
some infrastructure support in the device set-up scripts, but after
that, will probably implement storage migration for 4.4.


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