Detaching Volume Error

[Grinas]

Hey,

I have a 2*3TB volume that is mirror. I recently bought an extra 3TB drive so i want to delete the current volume and create a RAIDZ1 or RAIDZ2 array with the 3 drives as i have backed up everything from the volume.
But I'm having trouble detaching the array this is the error i get.

Code:

Request Method:	  POST	
	
	 Request URL:	  http://192.168.0.111/storage/detach/7/	
	
	 Software Version:	  FreeNAS-11.1-U1 (f7e246b8f)	
	
	 Exception Type:	  MiddlewareError	
	
	 Exception Value:	
[MiddlewareError: Failed to detach ThreeTBM with "zpool export ThreeTBM" (exited with 1): cannot unmount '/mnt/ThreeTBM/media/torrentfiles': Device busy
]
		
	 Exception Location:	  ./freenasUI/middleware/notifier.py in volume_detach, line 2601 

what i have done:
i have disabled all sharing services
disabled all jails
multiple restarts but still can't get it to detach.
shutdown all VMs
via command console deleted everything in /torrentfiles directory

Anyone have an idea of the cause before i attempt my last option which is shutdown the Server and format the drives in another PC.

 

[Grinas]

Update:

I found the cause i missed one of the jails when i was shutting them down.

I didnt delete the thread in the off chance someone else has the same problem