[CentOS] md raid 10

 > i then have to redo my entire array...and loose space inside the
 > array.  Plus if i raid1 it then i only have two bootable disks..at
 > least this way i have 4 bootable disks..:)

Lose space? 100 or 200MB? Why the heck wouldn't you be able to spare 100 
or 200MB of the gigantic size of today's drives?