On ganeti, shutdown the instance and activate its disks:

z2-8:~# gnt-instance shutdown nerrant Waiting for job 1089813 for nerrant... z2-8:~# gnt-instance activate-disks nerrant z2-8.host.gnt:disk/0:/dev/drbd10

On an OpenStack Havana installation using a Ceph cinder backend, create a volume with the same size:

# cinder create --volume-type ovh --display-name nerrant 10 +---------------------+--------------------------------------+ | Property | Value | +---------------------+--------------------------------------+ | attachments | [] | | availability_zone | nova | | bootable | false | | created_at | 2013-11-12T13:00:39.614541 | | display_description | None | | display_name | nerrant | | id | 3ec2035e-ff76-43a9-bbb3-6c003c1c0e16 | | metadata | {} | | size | 10 | | snapshot_id | None | | source_volid | None | | status | creating | | volume_type | ovh | +---------------------+--------------------------------------+

rbd --pool ovh info volume-3ec2035e-ff76-43a9-bbb3-6c003c1c0e16

rbd image 'volume-3ec2035e-ff76-43a9-bbb3-6c003c1c0e16': size 10240 MB in 2560 objects order 22 (4096 KB objects) block_name_prefix: rbd_data.90f0417089fa format: 2 features: layering

On a host connected to the Ceph cluster and running a linux-kernel > 3.8 ( because of the format: 2 above ), map to a bloc device with:

# rbd map --pool ovh volume-3ec2035e-ff76-43a9-bbb3-6c003c1c0e16

rbd showmapped

id pool image snap device 1 ovh volume-3ec2035e-ff76-43a9-bbb3-6c003c1c0e16 - /dev/rbd1

Copy the ganeti volume with:

z2-8:~# pv < /dev/drbd10 | ssh bm0014 dd of=/dev/rbd1 2,29GB 0:09:14 [4,23MB/s] [==========================> ] 22% ETA 0:31:09

and unmap the device when it completes.

rbd unmap /dev/rbd1

The volume is ready to boot.