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Boxiang,

I have not herd any discussion of extending this functionality for Ceph 
to work between different Ceph Clusters.  I wasn't aware, however, that 
the existing spec was limited to one Ceph cluster. So, that is good to know.

I would recommend reaching out to Jon Bernard or Eric Harney for 
guidance on how to proceed.  They work closely with the Ceph driver and 
could provide insight.

Jay


On 10/19/2018 10:21 AM, Boxiang Zhu wrote:
>
> Hi melanie, thanks for your reply.
>
> The version of my cinder and nova is Rocky. The scope of the cinder 
> spec[1]
> is only for available volume migration between two pools from the same 
> ceph cluster.
> If the volume is in-use status[2], it will call the generic migration 
> function. So that as you
> describe it, on the nova side, it raises NotImplementedError(_("Swap 
> only supports host devices").
> The get_config of net volume[3] has not source_path.
>
> So does anyone try to succeed to migrate volume(in-use) with ceph 
> backend or is anyone doing something of it?
>
> [1] https://review.openstack.org/#/c/296150
> [2] 
> https://review.openstack.org/#/c/256091/23/cinder/volume/drivers/rbd.py
> [3] 
> https://github.com/openstack/nova/blob/stable/rocky/nova/virt/libvirt/volume/net.py#L101
>
>
> Cheers,
> Boxiang
> On 10/19/2018 22:39，melanie witt<melwittt at gmail.com> 
> <mailto:melwittt at gmail.com> wrote：
>
>     On Fri, 19 Oct 2018 11:33:52 +0800 (GMT+08:00), Boxiang Zhu wrote:
>
>         When I use the LVM backend to create the volume, then attach
>         it to a vm.
>         I can migrate the volume(in-use) from one host to another. The
>         nova
>         libvirt will call the 'rebase' to finish it. But if using ceph
>         backend,
>         it raises exception 'Swap only supports host devices'. So now
>         it does
>         not support to migrate volume(in-use). Does anyone do this
>         work now? Or
>         Is there any way to let me migrate volume(in-use) with ceph
>         backend?
>
>
>     What version of cinder and nova are you using?
>
>     I found this question/answer on ask.openstack.org:
>
>     https://ask.openstack.org/en/question/112954/volume-migration-fails-notimplementederror-swap-only-supports-host-devices/
>
>     and it looks like there was some work done on the cinder side [1] to
>     enable migration of in-use volumes with ceph semi-recently (Queens).
>
>     On the nova side, the code looks for the source_path in the volume
>     config, and if there is not one present, it raises
>     NotImplementedError(_("Swap only supports host devices"). So in your
>     environment, the volume configs must be missing a source_path.
>
>     If you are using at least Queens version, then there must be
>     something
>     additional missing that we would need to do to make the migration
>     work.
>
>     [1] https://blueprints.launchpad.net/cinder/+spec/ceph-volume-migrate
>
>     Cheers,
>     -melanie
>
>
>
>
>
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