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Bcachefs is a next-generation CoW filesystem that aims to provide features from Btrfs and ZFS with a cleaner codebase, more stability, greater speed and a GPL-compatible license.

It is built upon Bcache and is mainly developed by Kent Overstreet.


Bcachefs is not in the upstream Kernel yet but the linux-bcachefs-gitAUR kernel can be installed from the AUR.

The Bcachefs userspace tools are available from bcachefs-tools-gitAUR.


Single drive

# bcachefs format /dev/sda1
# mount -t bcachefs /dev/sda1 /mnt

Multiple drives in RAID0/1

# bcachefs format /dev/sda1 /dev/sdb1 --data_replicas=n --metadata_replicas=n
# mount -t bcachefs /dev/sda1:/dev/sdb1 /mnt

Using ssds as a caching layer

# bcachefs format \
    --group=ssds /dev/sda1 /dev/sdb1 
    --group=hdds /dev/sdc1 /dev/sdd1 /dev/sde1 /dev/sdf1
    --foreground_target=ssds \
    --background_target=hdds \
# mount -t bcachefs /dev/sda1:/dev/sdb1:/dev/sdc1:/dev/sdd1/dev/sde1:/dev/sdf1 /mnt

Tips and tricks


Up-to-date documentation is only available via bcachefs --help. The man page, for instance, includes the now-useless --tier option.

See also