moving '/' to a new disk

["tim" <tdwebste@netcentricnj.com>]

I currently Have:
Filesystem           1k-blocks      Used Available Use% Mounted on 
/dev/sdc1              2064144     16892   1942372   1% /  
/dev/sda1                15522      2943     11778  20% /boot 
/dev/md1               4001600    965072   3036528  25% /usr 
/dev/md2               3356180    325708   3030472  10% /var 

I want:
Filesystem           1k-blocks      Used Available Use% Mounted on 
/dev/md0              2064144     16892   1942372   1% /  
/dev/sda1                15522      2943     11778  20% /boot 
/dev/md1               4001600    965072   3036528  25% /usr 
/dev/md2               3356180    325708   3030472  10% /var

where raidtab will be:
#/ 
raiddev /dev/md0 
raid-level 1 
nr-raid-disks 2 
persistent-superblock 1 
chunk-size 16 
device /dev/sda3 
raid-disk 0 
device /dev/sdb3 
raid-disk 1 

#/usr 
raiddev /dev/md1 
raid-level 0 
nr-raid-disks 2 
persistent-superblock 1 
chunk-size 16 
device /dev/sda5 
raid-disk 0 
device /dev/sdb5 
raid-disk 1 

#/var 
raiddev /dev/md2 
raid-level 0 
nr-raid-disks 2 
persistent-superblock 1 
chunk-size 16 
device /dev/sda6 
raid-disk 0 
device /dev/sdb6 
raid-disk 1