Ubuntu Natty ami-1aad5273

install raid (f-k are attached ebs volumes):
sudo apt-get -y install mdadm lvm2 xfsprogs xfsdump attr attr-dev
sudo modprobe dm-mod
sudo mdadm--create /dev/md0 --level=1 --chunk=256 --raid-devices=4 /dev/xvdf /dev/xvdg /dev/xvdh /dev/xvdi
sudo blockdev --setra 65536 /dev/md0
sudo mkfs -t xfs /dev/md0
sudo mkdir /raid
sudo mount /dev/md0 /raid

add to fstab:
/dev/md0    /raid   xfs noatime,noexec,nodiratime   0   0