dmsetup remove_all
wipefs -a --force /dev/nvme0n1p4
mkfs -t btrfs /dev/nvme0n1p4
mkdir -p /fs/nvme0n1p4
mount -t btrfs /dev/nvme0n1p4 /fs/nvme0n1p4

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

echo '[global]
bs=4k
ioengine=sync
iodepth=32
size=34359738368
nr_files=1
filesize=34359738368
direct=0
runtime=300
invalidate=1
fallocate=posix
io_size=34359738368
file_service_type=roundrobin
random_distribution=random
group_reporting
pre_read=0

[task_0]
rw=randwrite
directory=/fs/nvme0n1p4
numjobs=8' | fio --output-format=json -