aws上创建raid0:
mdadm --create /dev/md0 --level=0 -c256 --raid-devices=8 /dev/sdf /dev/sdg /dev/sdh /dev/sdi /dev/sdj /dev/sdk /dev/sdl /dev/sdm
echo 'DEVICE /dev/sdf /dev/sdg /dev/sdh /dev/sdi /dev/sdj /dev/sdk /dev/sdl /dev/sdm' > /etc/mdadm.conf
mdadm --detail --scan >> /etc/mdadm.conf
blockdev --setra 65536 /dev/md0
mkfs -t ext3 /dev/md0
mount /dev/md0 /data1/test