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Hi Massimo,

Though I don't have experience on the migration, but as the glance RBD
driver maintainer and image service maintainer of our public cloud
(Catalyst Cloud based in NZ), I'm happy to provide some information.
Before I talk more, would you mind sharing some information of your
environment?

1. Are you using CoW of Ceph?

2. Are you using multi locations? 

show_multiple_locations=True

3. Are you expecting to migrate all the images in a maintenance time
window or you want to keep the glance service running for end user
during the migration?

4. Is it a public cloud?


On 25/03/17 04:55, Massimo Sgaravatto wrote:
> Hi
>
> In our Mitaka cloud we are currently using Gluster as storage backend
> for Glance and Cinder.
> We are now starting the migration to ceph: the idea is then to dismiss
> gluster when we have done.
>
> I have a question concerning Glance. 
>
> I have understood (or at least I hope so) how to add ceph as store
> backend for Glance so that new images will use ceph while the
> previously created ones on the file backend will be still usable.
>
> My question is how I can migrate the images from the file backend to
> ceph when I decide to dismiss the gluster based storage.
>
> The only documentation I found is this one:
>
> https://dmsimard.com/2015/07/18/migrating-glance-images-to-a-different-backend/
>
>
> Could you please confirm that there aren't other better (simpler)
> approaches for such image migration ?
>
> Thanks, Massimo
>
>
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-- 
Cheers & Best regards,
Feilong Wang (王飞龙)
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Senior Cloud Software Engineer
Tel: +64-48032246
Email: flwang at catalyst.net.nz
Catalyst IT Limited
Level 6, Catalyst House, 150 Willis Street, Wellington
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