I have opened a bug tracker with some more information to
this issue

-> https://tracker.ceph.com/issues/56147




On Fri, 17 Jun 2022 07:56:47 +0000
Manuel Lausch <[email protected]> wrote:

> ?
> 
> Hello,
> 
> these days I discovered some strange behavior with snapshot deletes after 
> upgrading from 14.2.22 (nautilus) to 16.2.9 (pacific)
> 
> The pools are used with librados (no rbd, cephfs or something like that).
> We create daily one snapshot and delete them after 7 days again. Since the 
> upgrade to pacific the "clones" from the pool corresponding to the snapshot 
> will not be removed nor the space will be freed up. In "rados lssnaps" the 
> snapshot is gone.
> 
> After I discovered that, I had a look on the old graphs from a small 
> testcluster we upgraded a half a year ago from nautilus to octopus. It seems 
> that "clones" from snapshots which was created with nautilus will not be 
> freed up after removing them with octopus. Snapshots created since the 
> upgrade works fine.
> 
> It looks like  I have now old "clones" which will not be deleted anymore.
> Is there some way to cleanup the old garbage?
> And how can I avoid it when upgrading my other clusters, without the option 
> to delete all snapshots prior the update.
> 
> 
> Manuel?
> 
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