CEPH 12.2.2
So I have a snapshot of an image:
$ rbd du ssd-volumes/volume-4fed3f31-0802-4850-91bc-17e6da05697d
NAME PROVISIONED USED
volume-4fed3f31-0802-4850-91bc-17e6da05697d@snapshot-d2145e21-99a7-4e2e-9138-ab3e975f8113 20480M 8088M
volume-4fed3f31-0802-4850-91bc-17e6da05697d 20480M 1152M
<TOTAL> 20480M 9240M
I create a clone, and then flatten it.
Here's a clone before flatten:
$ rbd info ssd-volumes/volume-0578b38a-8db2-481f-ad43-65d21b09c89b
rbd image 'volume-0578b38a-8db2-481f-ad43-65d21b09c89b':
size 20480 MB in 5120 objects
order 22 (4096 kB objects)
block_name_prefix: rbd_data.33717c18c5a7e1
format: 2
features: layering, exclusive-lock, object-map, fast-diff, deep-flatten
flags:
parent: ssd-volumes/volume-4fed3f31-0802-4850-91bc-17e6da05697d@snapshot-d2145e21-99a7-4e2e-9138-ab3e975f8113
overlap: 20480 MB
$ rbd du ssd-volumes/volume-0578b38a-8db2-481f-ad43-65d21b09c89b
NAME PROVISIONED USED
volume-0578b38a-8db2-481f-ad43-65d21b09c89b 20480M 0
After flatten:
$ rbd info ssd-volumes/volume-0578b38a-8db2-481f-ad43-65d21b09c89b
rbd image 'volume-0578b38a-8db2-481f-ad43-65d21b09c89b':
size 20480 MB in 5120 objects
order 22 (4096 kB objects)
block_name_prefix: rbd_data.33717c18c5a7e1
format: 2
features: layering, exclusive-lock, object-map, fast-diff, deep-flatten
flags:
$ rbd du ssd-volumes/volume-0578b38a-8db2-481f-ad43-65d21b09c89b
NAME PROVISIONED USED
volume-0578b38a-8db2-481f-ad43-65d21b09c89b 20480M 20480M
Clone is now using 100% provisioned space.
I was under impression that flattened clones should be sparse. Am I wrong or missing something?
Don't think this is relevant, but snapshot and clone creation are managed by cinder in Openstack Newton release.
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