Periodic snapshot retention policy not working (old snapshots not being deleted)

[derzahla]

Hi, I can't seem to get old snapshots to be autoremoved as I have configured. I am taking recursive hourly, daily and weekly snapshots of my entire zpool. Policy is configured to save 3 hourly, 14 daily and 8 weekly snapshots - but nothing ever gets deleted. I just realized I have hundreds of hourly snapshots per dataset and daily snapshots going back 2 months. Is there a trick I'm missing here?

 

[rudds]

It seems like there's a bug with custom retention policies for snapshots as I'm having a similar problem.

TrueNAS snapshots my pool hourly with a 3-day expiration, and all snapshots are also synced to an external pool overnight via a replication task, with a custom retention set on those replicated snapshots of 6 weeks. However I just checked my external pool and those snapshots are also being deleted after 3 days to match the originals, so it seems like the system is ignoring the 6-week custom retention in the replication task.

Also found this post from last year with similar problems, so this feature seems to be giving a lot of people trouble:

Custom Snapshot Retention Policy not working, old snapshots not deleted on slave [11.3]

I have 2 FreeNAS 11.3 servers. The first server A replicates ZFS snapshots to server B. Snapshots on A are hold for several days. In the replication task the policy is shorter to save diskspace on B, but the old snapshots on B are not deleted?

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