Quote Originally Posted by Geoff
The drive had not entirely failed. It physically worked and the drive electronics responded however the data was gone. In such situations Linux tends to err on the side of caution. Thus requiring a little manual intervenion. Chances are the drive could of been marked manually as failed and the array would of come back on-line. However running a raid5 array with a drive down is a really bad idea and should be avoided at all costs.
Ah... ok... that makes more sense..

Thanks for the explanation and I'd definitely agree with the last sentiment... waiting on something like this is no option.