I have three HDD connected to a Raspberry Pi running OMV 3.0.76 (Erasmus). On the Storage > S.M.A.R.T. > Settings page I have SMART enabled. On the the Storage > S.M.A.R.T. > Devices page I see my three HDDs. One has its "Monitor" switch thingy showing in green. So that one is enabled. The other two have the toggle in gray and they don't respond to my attempts to change them. The drive that has monitoring enabled, and one of the drives where it is not enabled are the same model drives. And I have checked the SMART data on all three drives before I mounted them on this file server, so I know they have SMART capability.
How can I enable S.M.A.R.T. testing/monitoring on all three drives?