One thing I noticed in FreeNAS 11.3-U5 is that Periodic Snapshots stopped working. It seems to be because the schedule (cron line syntax) was not recognized.
Fixing the cron line solved the problem.
Some other people that had similar issues:
I am still stuck on 11.2 due to the fact that I cannot seem to migrate my old jails to iocage. 2 of them are a plugins (Nextcloud and Plex) and 2 of them are warden (minidlna and git). Concerned about dataloss but when I use the script, I keep getting syntax errors. Not sure what I am doing wrong?
I only migrated a warden jail, so I don’t really know if there is anything special about plugin jails.
This forum discussion has some good information about using migrate_warden.py:
The invocation is: migrate_warden.py -v -j jailname -p poolname
iocage has to be “initialized” before use. (that means a pool has been specified to hold iocage jails)
If you post the output when you try to use migrate_warden.py it could give some clues.