I recently had an issue on my Unraid server: I wanted to delete a share (“myshare”) via the GUI, but it just did not do it. When I checked the logs, I found the following:

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Dec 27 21:53:24 tower emhttpd: readlink -e '/mnt/user/myshare'
Dec 27 21:53:24 tower emhttpd: /mnt/user/myshare
Dec 27 21:53:24 tower emhttpd: shcmd (750): rmdir '/mnt/user/myshare'
Dec 27 21:53:24 tower shfs: /usr/sbin/zfs unmount 'cache/myshare' 2>&1
Dec 27 21:53:24 tower shfs: /usr/sbin/zfs destroy 'cache/myshare' 2>&1
Dec 27 21:53:24 tower shfs: cannot destroy 'cache/myshare': dataset is busy
Dec 27 21:53:24 tower shfs: /usr/sbin/zfs mount 'cache/myshare' 2>&1

So apparently the dataset is busy 😐…
Weird, because it’s completely empty and no Containers or VMs are supposed to use the share. The hints that I found on the Internet did not help me:

  • Stopping the Array and then destroying the ZFS dataset manually => Not possible to access the dataset when the Array is stopped
  • Rebooting the Server and then retrying => same result as before

Solution

What ultimatively helped in my case was removing the folder in the filesystem and then destroying the ZFS dataset. To do so, I ran the following commands via SSH:

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rm /mnt/cache/myshare -d
zfs destroy cache/myshare