Issue

Unable to create RAID device on a host.
After issuing following command

mdadm --create /dev/md0 --level=0 --raid-devices=2 /dev/sdd1 /dev/sde1

it says that /dev/sdd1 is busy

cat /proc/mdstat
Personalities :
md0 : inactive sdd1[0](S)
      292928154 blocks super 1.2

unused devices: <none>

• I installed 2 Fusion IO ssd drives. I can see both drives and am able to create/delete partition with fdisk. But, mdadm failed to create raid device with following error messages:

# mdadm --create /dev/md0 --level=0 --chunk=256 --raid-devices=2 /dev/fioa /dev/fiob
mdadm: cannot open /dev/fioa: Device or resource busy

• mdadm fail to create software raid device with Device or resource busy error message.