[ale] raid drive

[dcorbin at machturtle.com (David Corbin)]

piano sbin # cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 hdc4[1] hda4[2](F)
      115113664 blocks [2/1] [_U]

unused devices: <none>


Does this mean that hda4 has failed?  What is the "correct" procedure here?  
Replace the drive seems reasonable, but I do want to be sure it's "ill" 
before I do that.


Many thanks.
-- 
David Corbin