Fri Aug 3 13:33:49 UTC 2007
# mdadm --force --run /dev/md0
A better way to understand what is going on is to look at /proc/mdstat and /proc/partitions. Does /dev/md0 show up in /proc/partitions? RAID5 arrays some time have to be kicked to start when they are degraded - unfortunately it happens infrequently enough to me that I forget the exact command. If the above doesn't work - try Google. Once it shows up in /proc/partitions it should be mountable assuming you once were successful in putting an xfs on it in the first place.
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