On Thu, 27 Apr 2023 09:07:10 +0200 Tobias Hachmer <t.hachmer@xxxxxx> wrote: > But we observed that max 50 snapshot are preserved. If a new snapshot is > created the oldest 51st is deleted. > > Is there a limit for maximum cephfs snapshots or maybe this is a bug? I've been wondering the same thing for about 6 months now and found the reason just yesterday. The snap-schedule mgr module has a hard limit on how many snapshots it preserves, see [1]. It's even documented at [2] in section "Limitations" near the end of the page. The commit[3] implementing this does not only not explain the reason for the number at all, it doesn't even mention the fact it implements this. Given the limitation is per directory, I'm currently trying this: / 1d 30d /foo 1h 48h /bar 1h 48h I forgot to activate the new schedules yesterday so I can't say whether it works as expected yet. Cheers, sur5r [1] https://github.com/ceph/ceph/blob/3d7761bd59b8e5ebac1d9a136d020f0f8d2eaf32/src/pybind/mgr/snap_schedule/fs/schedule_client.py#L21 [2] https://docs.ceph.com/en/quincy/cephfs/snap-schedule/ [3] https://github.com/ceph/ceph/commit/a48efa43dbe4c623ae88b84ef538ee306fc1eee8 -- ceterum censeo microsoftem esse delendam.
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