ArchLinux RAID Creation

raid.sh

#!/bin/bash

arrayname='media'

# 150G partitions, fd00 filesystem type
gdisk /dev/sdb
gdisk /dev/sdc
gdisk /dev/sdd

mdadm --verbose -C /dev/md0 -l6 -Nmedia -n12 \
/dev/sdb1 /dev/sdb2 /dev/sdb3 /dev/sdb4 /dev/sdb5 /dev/sdc1 \
/dev/sdc2 /dev/sdc3 /dev/sdc4 /dev/sdc5 /dev/sdd1 /dev/sdd2 \
-x3 /dev/sdb6 /dev/sdc6 /dev/sdd3

mdadm --detail --scan >> /etc/mdadm.conf

mdadm --assemble --scan
stride=`expr 512 / 4`
stripe=$(echo "${stride}*11" | bc -l)

mkfs.ext4 -v -L ${arrayname} -m 0.01 -b 4096 -E stride=${stride},stripe-width=${stripe} /dev/md0