I have not kicked it off yet, once I do I'll leave the box un-ticked.
I did not see your reply in time and it ran as I didn't know how to stop it. Looks like I still have problems, lots of reiserfs errors and mover related entries in the syslog which I have attached. The problem drive is in green status and the share is still amber so I'm not sure what to do next.
Edit: I just noticed that the reiserfs and other errors are logged against device sdb1 (my cache drive) and the drive that dropper offline was sdf. Also, my drives are all getting pretty full, 96% is the minimum level.
Edit 2: Have also added the Smart report for SDB1, it has 2 current pending sectors so looks like it might be a bit sick. Being my cache drive how can I recover from this?
syslog-2016-06-181.zip
SMART_Report_SDB1_20160618.txt