Replication: cannot destroy 'backupcloud/backup': dataset is busy


TrueNas Core: TrueNAS-13.0-U6.1
Recently I have been getting the following errors backing up, it tends to happen at the same time early in the morning.

cannot destroy ‘backupcloud/backup’: dataset is busy.
[2024/05/02 06:28:42] INFO [Thread-11] [zettarepl.paramiko.replication_task__task_1] Connected (version 2.0, client OpenSSH_8.2p1)
[2024/05/02 06:28:42] INFO [Thread-11] [zettarepl.paramiko.replication_task__task_1] Authentication (publickey) successful!
[2024/05/02 06:28:43] INFO [replication_task__task_1] [zettarepl.replication.pre_retention] Pre-retention destroying snapshots:
[2024/05/02 06:28:43] INFO [replication_task__task_1] [] For replication task ‘task_1’: doing push from ‘Main/NAS’ to ‘backupcloud/backup’ of snapshot=‘auto-2024-05-02_06-27’ incremental_base=None receive_resume_token=None encryption=False
[2024/05/02 10:03:40] ERROR [replication_task__task_1.dataset_size_observer] [zettarepl.replication.dataset_size_observer] Unhandled exception in dataset size observer
Traceback (most recent call last):
File “/usr/local/lib/python3.9/site-packages/zettarepl/replication/”, line 41, in _run
File “/usr/local/lib/python3.9/site-packages/zettarepl/replication/”, line 51, in _run_once
dst_used = get_property(self.dst_shell, self.dst_dataset, “used”, int)
… 136 more lines …
lambda: run_replication_task_part(replication_task, source_dataset, src_context, dst_context,
File “/usr/local/lib/python3.9/site-packages/zettarepl/replication/”, line 274, in run_replication_task_part
resumed = resume_replications(step_templates, observer)
File “/usr/local/lib/python3.9/site-packages/zettarepl/replication/”, line 481, in resume_replications[“zfs”, “recv”, “-A”, dst_dataset])
File “/usr/local/lib/python3.9/site-packages/zettarepl/transport/”, line 92, in exec
return self.exec_async(args, encoding, stdout).wait(timeout)
File “/usr/local/lib/python3.9/site-packages/zettarepl/transport/”, line 63, in wait
raise ExecException(exitcode, stdout)
zettarepl.transport.interface.ExecException: cannot destroy ‘backupcloud/backup’: dataset is busy

The destination is a Ubuntu server with ‘ZFS utils-linux’ installed and has been working fine in my old house. Setup using these notes:

Recently I have installed Starlink and have just linked this issue to the morning reboots, I guess it is doing Starlink updates, it does not seem to be able to resume. The time-frames match. While I wait for Fiber to arrive, is there anything I can adjust on the task to resolve this error? I have tried replication from scratch also, to no avail

Any “cloned” datasets?

Any snapshots being protected with “hold”?

Thanks for replying

I have never cloned a dataset. I don’t recall seeing an option to set a hold, I have only ever used the GUI. From seeing this post, (linked below), I have ran the following commands

zfs list -H -t snap -o name -r | xargs zfs holds

This returned nothing

zfs get -r -t filesystem origin Main/NAS

Main/NAS origin - -

I don’t think I have anything on hold

My setup:

Replication Task:

Anything stand out ?