This will be the second time this has happened to me in 2 years.
Different controllers, different external arrays, different servers,
different locations.

My HP Dl360G4 with it's Smart Array 6400 controller reported a drive
failure today and went offline.

Going into the array configurations, it thinks 4 drives were replaced,
and that one drive is just plain missing.

Last time I saw that happen it was with an Adaptec and it thought all 9
drives were missing with 9 new drives in their place.