Looking at my nightly email from unraid about the array's health report, it shows as 'Passed' but I notice that all the drives were spun up (except for 1 anyway). So I log into the server to see if they still are, and they were all still spun up, so I click the button to spin them all down to see if they'll stay down but all the icons do is spin. I try each drive individually, with no effect on any of them, so I open up the log to see if there's any spindown commands noted. Turns out two of the drives were disabled, and the emhttpd process had segfaulted shortly after the drives show disconnected and re-connected.
The dashboard continued to show no issues and send an ALL OK Bro! email..... If I hadn't noticed the drives spun up and investigated, it might have been a while before I would have any reason to look at it...
What's the point of the health email if it doesn't report the actual health of the array?