Trouble removing dataset - device busy

[chrisf]

All...having a bit of an issue. I am trying to remove an old 50gb dataset and it keeps telling me its busy. Anyone know how to remove it? I have tried the GUI and via the command line (zfs -d and zfs -f) and no luck. Keep getting:

cannot unmount: /mnt/FREENAS/***x: device is busy

Thanks in advance!

CF

 

[paleoN]

Something is likely holding the dataset open: share, ssh home, service/plugin, etc. Whatever it is stop/delete it first.

 

[Pseudolife]

I was having this problem, and I even removed my plug-ins and killed all the shares aimed at that dataset. I rebooted the server, and still couldn't get the dataset to let go.

It turns out the problem was an old mount in Jails. Both the Jail and plugin it related to were gone, but the storage mount was still there.

So, if you end up like me, make sure to check here:
Click on the Jails button at the top of the GUI (9.3), then the Storage button under the tab, and make sure there aren't any mounts of that dataset into any jails (even if the jails themselves are gone.)

Sorry about the thread necro.

 

[tjvanpat]

Since this is the top hit for this problem, here is how I forcefully unmounted the dataset, so it could be deleted:

sudo zfs unmount -f </mnt/volume/dataset>

 

[maxx]

Since this is the top hit for this problem, here is how I forcefully unmounted the dataset, so it could be deleted:

sudo zfs unmount -f </mnt/volume/dataset>

This worked great but I needed to enable "Allow SUDO" for user ROOT since it wasn't set for some reason.

 

[danb35]

This worked great but I needed to enable "Allow SUDO" for user ROOT since it wasn't set for some reason.

If you're already root, you don't need to sudo. In that case you'd just type 'zfs unmount...', not 'sudo zfs unmount...'.