Destroy an unallocated disk safely

[pinguin]

Hello,

I was trying to destroy an unallocated disk, but I got the following error:

TASK ERROR: zfs error: cannot destroy 'xxx/subvol-xxx-disk-0': dataset is busy

How can I destroy the disk safely without a reboot? A reboot is not a good time at the moment.
I tried to kill some processes related to it, but without success...

 

[Stefan_R]

Is the dataset still mounted? Check with zfs mount or just mount.