Expanding a RAID – Part Deux

Make sure the filesystem isn’t being used:

sudo systemctl stop plexmediaserver
sudo systemctl stop smbd

unmount the filesystem

sudo umount /storage

use parted to resize the filesystem

sudo parted
resize part 1 100%

remount

sudo mount /storage

resize the Btrfs filesystem

sudo btrfs filesystem resize max /storage

and, all being well, the system isn’t hosed.