Hi Konstantin, Thank you very much. That's a good question. The implementations of OpenStack and Ceph and "the other" OpenStack and Ceph are, apart from networking, completely separate. In terms of OpenStack I can recreate the compute instances and storage volumes but obviously need to copy the data as well. This is fine for small to medium volumes but now I stumble into some large ones: up to 10 TiBs in size. My idea (and hope) is to be able to use Ceph's snapshot mechanismn. First: take and copy a snapshot from a certain RBD volume to the other cluster. Then, another snapshot and copy the delta. And then once again but with the compute instance shut off. K. On 14-05-2020 06:24, Konstantin Shalygin wrote: > Why just not migrate your VM's? _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx