test-raid.sh

#!/bin/sh

create()
{
        mdadm --stop /dev/md/swap 2>/dev/null
        mdadm --zero-superblock /dev/sd?1 2>/dev/null
        mdadm --create --verbose "$@" --raid-devices=4 /dev/md/swap /dev/sd?1 2>/dev/null
        while mdadm --detail /dev/md/swap | grep -q 'State : .*resyncing'; do
                sleep 1
        done
}

perftest()
{
        dd if=/dev/md/swap of=/dev/null bs=1M count=2000 2>&1 | tail -n1 | sed 's@.*, @  read: @'
        dd if=/dev/zero of=/dev/md/swap bs=1M count=2000 2>&1 | tail -n1 | sed 's@.*, @  write: @'
}

echo "Direct:"
mdadm --stop /dev/md/swap 2>/dev/null
mdadm --zero-superblock /dev/sd?1 2>/dev/null
dd if=/dev/sda1 of=/dev/null bs=1M count=2000 2>&1 | tail -n1 | sed 's@.*, @  read: @'
dd if=/dev/zero of=/dev/sda1 bs=1M count=2000 2>&1 | tail -n1 | sed 's@.*, @  write: @'

echo "RAID0:"
create --level=0
perftest

echo "RAID10 far:"
create --level=10 --layout=f2
perftest

echo "RAID10 near:"
create --level=10 --layout=n2
perftest

echo "RAID6:"
create --level=6
perftest