Can't create RAID 0 with Debian Lennny and mdadm on EC2

[Raleigh Guevarra <deathect@yahoo.com>]

Hi, 

We're trying to make a RAID 0 with four 150Gb each of volumes but we are getting this error:  /dev/sdl   /dev/sdm   /dev/sdn   /dev/sdo onn Amazon EC2

Linux MyServer 2.6.16.33-xenU #2 SMP Wed Aug 15 17:27:36 SAST 2007 x86_64 GNU/Linux


# mdadm --create /dev/md0 --level 0 --metadata=1.1 --raid-devices 4 /dev/sdl /dev/sdm /dev/sdn /dev/sdo 

mdadm: /dev/sdl appears to be part of a raid array: 
    level=raid0 devices=4 ctime=Thu Apr 30 20:48:41 2009 
mdadm: /dev/sdm appears to be part of a raid array: 
    level=raid0 devices=4 ctime=Thu Apr 30 20:48:41 2009 
mdadm: /dev/sdn appears to be part of a raid array: 
    level=raid0 devices=4 ctime=Thu Apr 30 20:48:41 2009 
mdadm: /dev/sdo appears to be part of a raid array: 
    level=raid0 devices=4 ctime=Thu Apr 30 20:48:41 2009 
Continue creating array? yes 
mdadm: RUN_ARRAY failed: Invalid argument 
mdadm: stopped /dev/md0 

and 

# mdadm --create /dev/md0 --level=0 --raid-devices=4 /dev/sdl1 /dev/sdm1 /dev/sdn1 /dev/sdo1 

mdadm: Cannot open /dev/sdl1: Device or resource busy 
mdadm: Cannot open /dev/sdm1: Device or resource busy 
mdadm: Cannot open /dev/sdn1: Device or resource busy 
mdadm: Cannot open /dev/sdo1: Device or resource busy 
mdadm: create aborted 


What are we missing? 


Thank you in advance,

Raleigh