Aha. I know. This was a temporary solution for this issue:
2019-03-28 20:32:59 crit mountd[6979]: could not find a serial number for the device sdb
This was September 2018 - still not fixed 
Aha. I know. This was a temporary solution for this issue:
2019-03-28 20:32:59 crit mountd[6979]: could not find a serial number for the device sdb
This was September 2018 - still not fixed