[pve-devel] busy dataset when trying the migrate iscsi disk

[Shannon Sterz]

Hi Lorne,

this is the development discussion list. If you need assistance with
your configuration, please take a look at the user forum [1]. If you
want to report a bug, please open a report over in our Bugzilla [2].

Best regards, Shannon

[1]: https://forum.proxmox.com/
[2]: https://bugzilla.proxmox.com/

On Mon Sep 15, 2025 at 5:34 AM CEST, Lorne Guse wrote:
> I'm working on TrueNAS over iSCSI for Proxmox and have run into an issue migrating disks. When trying to delete the old storage, which has just successfully been transfered, the iscsidirect connection must remain open because we are getting:
>
> cannot destroy 'slow/vm-188-disk-0': dataset is busy
>
> Is there a way to ensure the iscsidirect connection is closed before trying to delete the underlying zfs dataset?
>
>
> TrueNAS [INFO] : zvol/slow/vm-188-disk-0 with key 'path' found : /dev/zvol/slow/vm-188-disk-0
> TrueNAS [INFO] : zvol/slow/vm-188-disk-0 with key 'lunid' found : 3
> create full clone of drive scsi0 (iSCSI-vm-storage-HDD:vm-188-disk-0)
> TrueNAS [INFO] : /dev/zvol/fast/vm-188-disk-0
> TrueNAS [INFO] : Created LUN: /dev/zvol/fast/vm-188-disk-0 : T2:E236:L4
> TrueNAS [INFO] : zvol/fast/vm-188-disk-0 with key 'path' found : /dev/zvol/fast/vm-188-disk-0
> TrueNAS [INFO] : zvol/fast/vm-188-disk-0 with key 'lunid' found : 4
> drive mirror is starting for drive-scsi0
> mirror-scsi0: transferred 924.0 MiB of 32.0 GiB (2.82%) in 1s
> mirror-scsi0: transferred 1.8 GiB of 32.0 GiB (5.70%) in 2s
> mirror-scsi0: transferred 2.7 GiB of 32.0 GiB (8.56%) in 3s
> mirror-scsi0: transferred 3.7 GiB of 32.0 GiB (11.68%) in 4s
> mirror-scsi0: transferred 4.7 GiB of 32.0 GiB (14.54%) in 5s
> mirror-scsi0: transferred 5.5 GiB of 32.0 GiB (17.22%) in 6s
> mirror-scsi0: transferred 6.3 GiB of 32.0 GiB (19.71%) in 7s
> mirror-scsi0: transferred 7.1 GiB of 32.0 GiB (22.29%) in 8s
> mirror-scsi0: transferred 8.0 GiB of 32.0 GiB (24.97%) in 9s
> mirror-scsi0: transferred 8.8 GiB of 32.0 GiB (27.55%) in 10s
> mirror-scsi0: transferred 9.6 GiB of 32.0 GiB (30.06%) in 11s
> mirror-scsi0: transferred 10.6 GiB of 32.0 GiB (33.00%) in 12s
> mirror-scsi0: transferred 11.5 GiB of 32.0 GiB (36.04%) in 13s
> mirror-scsi0: transferred 12.5 GiB of 32.0 GiB (38.97%) in 14s
> mirror-scsi0: transferred 13.4 GiB of 32.0 GiB (41.72%) in 15s
> mirror-scsi0: transferred 14.2 GiB of 32.0 GiB (44.43%) in 16s
> mirror-scsi0: transferred 15.1 GiB of 32.0 GiB (47.25%) in 17s
> mirror-scsi0: transferred 16.1 GiB of 32.0 GiB (50.19%) in 18s
> mirror-scsi0: transferred 17.0 GiB of 32.0 GiB (53.15%) in 19s
> mirror-scsi0: transferred 18.0 GiB of 32.0 GiB (56.16%) in 20s
> mirror-scsi0: transferred 18.8 GiB of 32.0 GiB (58.88%) in 21s
> mirror-scsi0: transferred 19.8 GiB of 32.0 GiB (61.81%) in 22s
> mirror-scsi0: transferred 20.6 GiB of 32.0 GiB (64.42%) in 23s
> mirror-scsi0: transferred 21.5 GiB of 32.0 GiB (67.07%) in 24s
> mirror-scsi0: transferred 22.4 GiB of 32.0 GiB (70.02%) in 25s
> mirror-scsi0: transferred 23.3 GiB of 32.0 GiB (72.92%) in 26s
> mirror-scsi0: transferred 24.3 GiB of 32.0 GiB (75.80%) in 27s
> mirror-scsi0: transferred 25.1 GiB of 32.0 GiB (78.58%) in 28s
> mirror-scsi0: transferred 26.1 GiB of 32.0 GiB (81.62%) in 29s
> mirror-scsi0: transferred 27.1 GiB of 32.0 GiB (84.76%) in 30s
> mirror-scsi0: transferred 28.1 GiB of 32.0 GiB (87.73%) in 31s
> mirror-scsi0: transferred 29.1 GiB of 32.0 GiB (90.79%) in 32s
> mirror-scsi0: transferred 30.0 GiB of 32.0 GiB (93.73%) in 33s
> mirror-scsi0: transferred 30.9 GiB of 32.0 GiB (96.55%) in 34s
> mirror-scsi0: transferred 31.8 GiB of 32.0 GiB (99.44%) in 35s
> mirror-scsi0: transferred 32.0 GiB of 32.0 GiB (100.00%) in 36s, ready
> all 'mirror' jobs are ready
> mirror-scsi0: Completing block job...
> mirror-scsi0: Completed successfully.
> mirror-scsi0: mirror-job finished
> TrueNAS [INFO] : Ping
> TrueNAS [INFO] : Pong
> TrueNAS [INFO] : zvol/slow/vm-188-disk-0 with key 'path' found : /dev/zvol/slow/vm-188-disk-0
> TrueNAS [INFO] : Deleted LUN: zvol/slow/vm-188-disk-0
> cannot destroy 'slow/vm-188-disk-0': dataset is busy
> TrueNAS [INFO] : /dev/zvol/slow/vm-188-disk-0
> TrueNAS [INFO] : Created LUN: /dev/zvol/slow/vm-188-disk-0 : T5:E237:L3
> command '/usr/bin/ssh -o 'BatchMode=yes' -i /etc/pve/priv/zfs/vm-storage_id_rsa root at vm-storage zfs destroy -r slow/vm-188-disk-0' failed: exit code 1
> TASK OK
> [