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# Getting started
Bcachefs is not yet upstream - you'll have to
[[build a kernel|https://kernelnewbies.org/KernelBuild]] to use it.
First, check out the bcachefs kernel and tools repositories:
git clone https://evilpiepirate.org/git/bcachefs.git
git clone https://evilpiepirate.org/git/bcachefs-tools.git
Build and install as usual - make sure you enable `CONFIG_BCACHEFS_FS`. Then, to
format and mount a single device with the default options, run:
bcachefs format /dev/sda1
mount -t bcachefs /dev/sda1 /mnt
For a multi device filesystem, with sda1 caching sdb1:
bcachefs format /dev/sd[ab]1 \
--foreground_target /dev/sda1 \
--promote_target /dev/sda1 \
--background_target /dev/sdb1
mount -t bcachefs /dev/sda1:/dev/sdb1 /mnt
This will configure the filesystem so that writes will be buffered to /dev/sda1
before being written back to /dev/sdb1 in the background, and that hot data
will be promoted to /dev/sda1 for faster access.
See `bcachefs format --help` for more options.
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