If you use Amazon AWS cloud services you definitively want to utilize software raid for IO intensive stuff such as database data directories and the like.

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Here's how you create it:

• Create some EBS volumes within management console or
• sudo mdadm --create -f /dev/md0 --chunk=256 --level 10 --raid-devices 4 /dev/sdf /dev/sdg /dev/sdh /dev/sdi
• Create a fs on /dev/md0 using mkfs*-tools
• As soon as this is running, you should do that:
  sudo mdadm --detail --scan >> /etc/mdadm/mdadm.conf

Make sure the last line in /etc/mdadm/mdadm.conf looks like that

ARRAY /dev/md0 level=raid0 num-devices=4 metadata=00.90 UUID=1234567893:abcdef:123