Initial setup of Btrfs mirror

dd if=/dev/zero of=/dev/sda bs=4M count=100
parted /dev/sda mklabel gpt
parted /dev/sda mkpart storage-hdd1 0% 100%

dd if=/dev/zero of=/dev/sdb bs=4M count=100
parted /dev/sdb mklabel gpt
parted /dev/sdb mkpart storage-hdd2 0% 100%

mkfs.btrfs -L storage -m raid1 -d raid1 /dev/disk/by-partlabel/storage-hdd1 /dev/disk/by-partlabel/storage-hdd2

Setup fstab for automounting at boot

UUID=$(blkid -s UUID -o value /dev/disk/by-label/storage)

cat <<EOF>>/etc/fstab
UUID=$UUID /storage            btrfs defaults,nofail,noatime,autodefrag   0 0
EOF

mkdir /storage
systemctl daemon-reload
mount -a

Creation of Btrfs subvolumes

cd /storage

btrfs subvolume create audiobooks
btrfs subvolume create backups
btrfs subvolume create docker
btrfs subvolume create downloads
btrfs subvolume create ebooks
btrfs subvolume create kids
btrfs subvolume create movies
btrfs subvolume create music
btrfs subvolume create photos
btrfs subvolume create software
btrfs subvolume create torrents
btrfs subvolume create tvshows

chown 8888:8888 audiobooks downloads ebooks kids movies music photos software torrents tvshows

Setup of scrubbing

Manual scrub

btrfs scrub start /storage
btrfs scrub status /storage

Automate scrub

/etc/systemd/system/scrubber.service

[Unit]
Description=Scrub the Btrfs storage filesystem

[Service]
ExecStart=btrfs scrub start -Bd /dev/disk/by-label/storage

/etc/systemd/system/scrubber.trigger

[Unit]
Description=Scrubber service timer

[Timer]
OnBootSec=0min
OnCalendar=*-*-01 04:00:00
Unit=scrubber.service

[Install]
WantedBy=multi-user.target