root@xen-host4 ~# mdadm -C /dev/md0 -l raid0 --raid-devices=2 /dev/sdf1 /dev/sdg                      1
mdadm: array /dev/md0 started.
root@xen-host4 ~# mdadm --monitor /dev/md0
Oct  6 03:51:45: DeviceDisappeared on /dev/md0 Wrong-Level

root@xen-host4 ~# mdadm --query /dev/md0
/dev/md0: 3.83GiB raid0 2 devices, 0 spares. Use mdadm --detail for more detail.
/dev/md0: No md super block found, not an md component.
root@xen-host4 ~# mdadm --detail /dev/md0
/dev/md0:
        Version : 00.90.03
  Creation Time : Sat Oct  6 03:51:07 2007
     Raid Level : raid0
     Array Size : 4013824 (3.83 GiB 4.11 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Sat Oct  6 03:51:07 2007
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

     Chunk Size : 64K

           UUID : f775e55c:854a7bd8:f60d46be:da12c389
         Events : 0.1

    Number   Major   Minor   RaidDevice State
       0       8       81        0      active sync   /dev/sdf1
       1       8       97        1      active sync   /dev/sdg1