fdisk -H 224 -S 56 /dev/sda
  - create partitions

dd if=/dev/sda of=/dev/sdb count=100000
dd if=/dev/sda of=/dev/sdc count=100000
dd if=/dev/sda of=/dev/sdd count=100000
  - stupid partition copy (same disks required!)

mdadd --create /dev/md1 --level 10 --raid-devices 4 /dev/sd[a-d]3 --chunk=1024


# see calculator http://busybox.net/~aldot/mkfs_stride.html
mkfs.ext3 -b 4096 -E stride=256,stripe-width=512  /dev/md1