dmsetup remove_all
wipefs -a --force /dev/sdb1
wipefs -a --force /dev/sdb2
mkfs -t btrfs /dev/sdb1
mkfs -t btrfs /dev/sdb2
mkdir -p /fs/sdb1
mount -t btrfs /dev/sdb1 /fs/sdb1
mkdir -p /fs/sdb2
mount -t btrfs /dev/sdb2 /fs/sdb2

for cpu_dir in /sys/devices/system/cpu/cpu[0-9]*
do
	online_file="$cpu_dir"/online
	[ -f "$online_file" ] && [ "$(cat "$online_file")" -eq 0 ] && continue

	file="$cpu_dir"/cpufreq/scaling_governor
	[ -f "$file" ] && echo "performance" > "$file"
done

iozone -a -f /fs/sdb1/iozonetest &
iozone -a -f /fs/sdb2/iozonetest &
wait