My Drobo 5C failed a drive that I thing is still good (two and a half years old, less than 500 power-on hours, good S.M.A.R.T attributes, passed internal self-test).
Unfortunately there is no chance to find out why the Drobo considered the drive as failed. So I tried to re-insert the drive, in case the canact was just bad, but that didn’t help.
So I’m requesting some better explanations (i.e. reasoning) for “failed” drive events.