Btrfs
- list available devices
btrfs device scan
- list available filesystems
btrfs filesystem show
- create volume
mkfs.btrfs /dev/sdX
- stripe across devices (mirror metadata + stripe data)
mkfs.btrfs /dev/sda /dev/sdb /dev/sdc
- stripe across devices (stripe metadata + stripe data)
mkfs.btrfs -m raid0 /dev/sda /dev/sdb /dev/sdc
- mirror across devices (mirror metadata + mirror data)
mkfs.btrfs -m raid10 -d raid10 /dev/sda /dev/sdb /dev/sdc
- create subvolume
btrfs subvolume create /mnt/nonsense
where /mnt is the mountpoint of the btrfs volume
- list subvolumes
btrfs subvolume list /mnt
- create snapshot
mkdir /mnt/snapshots btrfs subvolume snapshot /mnt/nonsense /mnt/snapshots/vrijdag
- add a new device
btrfs device add /dev/sda8 /mnt
- remove a device
btrfs delete /dev/sdb /mnt
- free space:
btrfs fi df /
- show snapshots
snapper list
- delete all snapshots
for i in {1..20000}; do snapper delete $i; done
2015:
- balance om ruimte vrij te maken:
btrfs balance start /tmp/bla
als geen ruimte vrij:
btrfs balance start -musage=50 -dusage=50 /tmp/bla
btrfs fi show /tmp/bla btrfs fi df /tmp/bla
Onderhoud:
btrfs scrub is used to scrub a btrfs filesystem, which will read all data and metadata blocks from all devices and verify checksums. Automatically repair corrupted blocks if there’s a correct copy available.
btrfs scrub start -B /tmp/bla fstrim /tmp/bla
for conventiaonal HD's:
btrfs filesystem defragment /tmp/mnt/bla
recursief een directory:
btrfs filesystem defragment -r /tmp/mnt/bla