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<melwi...@gmail.com>
<mailto:melwi...@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
__________________________________________________________________________
OpenStack Development Mailing List (not for usage questions)
Unsubscribe:
openstack-dev-requ...@lists.openstack.org?subject:unsubscribe
http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
__________________________________________________________________________
OpenStack Development Mailing List (not for usage questions)
Unsubscribe: openstack-dev-requ...@lists.openstack.org?subject:unsubscribe
http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
__________________________________________________________________________
OpenStack Development Mailing List (not for usage questions)
Unsubscribe: openstack-dev-requ...@lists.openstack.org?subject:unsubscribe
http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
