BTRFS#

Vedi anche

  • Using Btrfs with Multiple Devices - btrfs Wiki [1]

  • Btrfs - ArchWiki [2]

  • Btrfs/Checksum Algorithms - Forza’s ramblings [3]

RAID#

Comandi#

Con questi esempi si da per scontato che un RAID 1 BTRFS (non BTRFS over mdadm RAID) è montato su /data.

Nota

After creating, adding or removing devices from an array always run the balance operation. You may want to use GNU screen to put the process in background, like this

apt-get install screen
screen btrfs balance start /data

Creazione#

  1. create the array

    mkfs.btrfs --csum xxhash -m raid1 -d raid1 /dev/sda1 /dev/sdb1

  2. monta normalmente

    mount /dev/sdb1 /data

  3. To add new partitions, for example /dev/sdc1 and /dev/sdd1, run

    btrfs device add /dev/sdc1 /dev/sdd1 /data

  4. esegui l’azione di balancing

Rimuovere devices#

  1. rimuovi due devices contemporaneamente

    btrfs device delete /dev/sdc1 /dev/sdd1 /data

  2. esegui l’azione di balancing

Sostituire un device#

  1. replace /dev/old with /dev/new. This operation should run in background

    btrfs replace start /dev/old /dev/new /data

  2. controllo

    btrfs replace status /data

Convert metadata profile#

You can clone partitions with dd from HDDs to SSDs. After that run:

screen btrfs balance start -v -mconvert=single /data

Controllo utilizzo#

btrfs filesystem usage /data
btrfs filesystem df /data

Note