Re-building an array

Hi List,

I am very new to raid, and I am having a problem.

I made a raid10 array, but I only used 2 disks.  Since then, one failed,
and my system crashes with a kernel panic.

I copied all the data, and I would like to start over.  How can I start
from scratch? I need to get rid of my /dev/md0, fully test the discs,
and build them over again as raid1 ?

Thanks!
Rick