Hi, I'm evaluating ceph (Jewel) for an application that will have a chain of layered images, with the need to sometimes flatten from the top to limit chain length. However, it appears that running "rbd flatten" causes loss of sparseness in the clone. For example: $ rbd --version ceph version 10.2.2 (45107e21c568dd033c2f0a3107dec8f0b0e58374) $ rbd du NAME PROVISIONED USED child 10240k 0 parent@snap 10240k 0 parent 10240k 0 <TOTAL> 20480k 0 $ rbd info child rbd image 'child': size 10240 kB in 3 objects order 22 (4096 kB objects) block_name_prefix: rbd_data.18c852eb141f2 format: 2 features: layering, exclusive-lock, object-map, fast-diff, deep-flatten flags: parent: rbd/parent@snap overlap: 10240 kB $ rbd flatten child Image flatten: 100% complete...done. $ rbd du NAME PROVISIONED USED child 10240k 10240k parent@snap 10240k 0 parent 10240k 0 <TOTAL> 20480k 10240k Is there any way to flatten a clone while retaining its sparseness, perhaps in Luminous or with BlueStore backend? Thanks, Kevin _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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