Thanks for the help, so no way to continue without moving 30TB of data off then back into the NAS?
Running extended HDD tests atm and will move to memtest once this is done.
So if something else in the NAS fails your data redundancy doesn't help and you can just lose the lot with 2 weeks worth of work getting it all out and back if it even allows that depending what goes wrong?
I'd be fine with redoing the DSM and that, is there no way to recover the Volume without the coping off then back on though?