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
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