[CentOS] raid array device partition missing

 From looking at mdstat it appears I have a RAID partition missing.
There are NO errors in /var/log/messages about disk errors or anything.
What happened to my sda1??? I had a power outage last week.

Any ideas??? Jerry

more /proc/mdstat

Personalities : [raid1]
md1 : active raid1 sdb3[1] sda3[0]
      236717696 blocks [2/2] [UU]

md0 : active raid1 sdb1[1]
      51199040 blocks [2/1] [_U]