Exactly, I have seen that. However, that also means that it is not a
"process" then, right? Am I missing something?

If we need a live process, where the clients cannot unmpa the volumes, what
do you guys recommend?

On Wed, Apr 12, 2023 at 10:01 AM Eugen Block <ebl...@nde.ag> wrote:

> Hi,
>
> the docs you mentioned also state:
>
> > All clients using the source image must be stopped prior to
> > preparing a live-migration. The prepare step will fail if it finds
> > any running clients with the image open in read/write mode. Once the
> > prepare step is complete, the clients can be restarted using the new
> > target image name. Attempting to restart the clients using the
> > source image name will result in failure.
>
> So I don't think you can live-migrate without interruption, at least
> not at the moment.
>
> Regards,
> Eugen
>
> Zitat von Work Ceph <work.ceph.user.mail...@gmail.com>:
>
> > Hello guys,
> >
> > We have been reading the docs, and trying to reproduce that process in
> our
> > Ceph cluster. However, we always receive the following message:
> >
> >
> > ```
> >
> > librbd::Migration: prepare: image has watchers - not migrating
> >
> > rbd: preparing migration failed: (16) Device or resource busy
> >
> > ```
> >
> >
> > We tested with both RDB blocks mounted with kRBD, and with librbd via
> > KVM/qEMU system. Both cases result in the same result. For KRBD, we
> > understood that it is not supported right now, but for librbd it seems
> that
> > it should be supported somehow.
> >
> >
> > How do you guys handle those situations?
> >
> >
> > We have the following use cases that might need an image to migrate
> between
> > pools while the client is still consuming it.
> >
> >    - RBD images that are consumed via the iSCSI gateways
> >    - RBD images mounted (rbd map) in hosts
> >    - RBD images used by KVM/Libvirt
> >
> >
> > Does Ceph support a live migration of images between pools while the
> > clients/consumers are still using those volumes?
> >
> >
> >
> >
> > [1] https://docs.ceph.com/en/quincy/rbd/rbd-live-migration/
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>
>
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