Quoting Burkhard Linke (Burkhard.Linke@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx):
> Hi,
> Images:
>
> Straight-forward attempt would be exporting all images with qemu-img from
> one cluster, and uploading them again on the second cluster. But this will
> break snapshots, protections etc.
You can use rbd-mirror [1] (RBD mirroring requires the Ceph Jewel release or
later.). You do need to be able to set the "journaling" and
"exclusive-lock" feature on the rbd images (rbd feature enable
{pool-name}/{image-name} --image-feature exclusive-lock,journaling).
This will preserve snapshots, etc. When everything is mirrored you can
shutdown the VMs (or one by one) and promote the image(s) on the new
cluster, and have the VM(s) use the new cluster for their storage.
Note: You can also mirror a whole pool instead of mirroring on image level.
Gr. Stefan
[1]: http://docs.ceph.com/docs/mimic/rbd/rbd-mirroring/
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