gistfile1.md

Launch your EC2 EBS instance with two SSDs on the second and third slots (after the root EBS volume), with this in your userdata:

#!/usr/bin/env bash

umount /dev/xvdb
umount /dev/xvdc
apt-get install mdadm -y
mkdir /u01
cat > /etc/init/mount-ephermal-ssd.conf  <<HERE
start on virtual-filesystems

script
  # Attempt a short circuit mount - one of these works 
  # after a reboot
  mount /dev/md127 /u01 && exit 
  mount /dev/md0 /u01 && exit 

  # It's possible this was a EC2 STOP/START - create everything from scratch
  # Although we specify md0, the actual device may be md127 upon reboot!!!
  yes | mdadm --create --verbose --force /dev/md0 --level=0 --raid-devices=2 /dev/xvdb /dev/xvdc

  # Last chance 
  mount /dev/md127 /u01 && exit  
  mount /dev/md0 /u01 && exit

  # Clean FS
  mkfs.ext4 /dev/md0 
  mount /dev/md127 /u01 && exit
  mount /dev/md0 /u01 && exit

end script
HERE

start mount-ephermal-ssd