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