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import existing cinder volumes from ceph into newly installed openstack

Hi I wiped my install of openstack, so basically its showing no instances, volumes, images anymore, basically factory reset. However the ceph cluster has not been touched and still has a few cinder volumes that I would like to re-import and use on some instances as data drives.

I can't seem to find a way to import an existing cinder volume from ceph which I can see still exists as an RBD image in there.

I know it probably possible to mount the drives to the host and copy data manually but I thought there might be a more elegant way of just telling cinder to re-import them.

Many thanks,