Raid-1 Question (just to be safe)

Hi all, I have a SuSE 8.1 computer running Raid-1 on 2 HDs (200GB each). Currently everything is working fine. In the extreme case when one of the 2 drives ceases to work, how will I be able to identify it? I mean will 'cat /proc/mdstat' shoot out something or will I see this from somewhere else? Has anyone seen this happen before?? As you can understand I am curious what the message will be in this case. Thank you all, Chris