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# Frequently Asked Questions
1. What is bcachefs
Bcachefs is an advanced new filesystem for Linux, with an emphasis on reliability
and robustness and the complete set of features one would expect from a modern filesystem.
2. How does bcachefs compare to other Linux filesystems like ext4, btrfs, xfs, and zfs?
The bcachefs filesystem has various advantages over other Linux filesystems.
Bcachefs is a feature complete filesystem while also containing extra features such as
checksumming and multi-device functionality within a filesystem. These are both features
that are absent from the ext4 and xfs filesystems. Other benefits presented by bcachefs
include a focus on reliability, robustness, and performance. Bcachefs is safer to use than
btrfs and is also shown to outperform zfs in terms of speed and reliability.
3. Is bcachefs stable for production use?
Bcachefs can currently be considered beta quality. It has a small pool of
outside users and has been stable for quite some time now; there's no reason
to expect issues as long as you stick to the currently supported feature set.
4. How do I install and use bcachefs on my Linux system?
Instructions for installation can be found here:
[[Getting Started|GettingStarted]]
The user manual can be found here:
[[bcachefs-principles-of-operation.pdf]]
5. Does bcachefs support data deduplication and compression?
Bcachefs currently does not support data deduplication however compression
is supported, more information can be found here: [[Compression]]
6. Is bcachefs included in the Linux kernel by default?
Bcachefs is not yet upstream - you will have to build a kernel to use it.
7. Are there any limitations or known issues with bcachefs?
Information on current bugs within bcachefs and related tooling can be found here:
[[bcachefs bugs|https://github.com/koverstreet/bcachefs/issues]]
[[bcachefs-tools bugs|https://github.com/koverstreet/bcachefs-tools/issues]]
Our Todo list can be found here:
[[Todo]]
8. What is the development status of bcachefs?
Currently we are working on getting bcachefs merged into the linux kernel.
A roadmap and features list can be found here:
[[Roadmap]]
9. Can I migrate my existing filesystem to bcachefs?
Yes, users can migrate their existing filesystems into a bcachefs filesystem
using the 'bcachefs migrate' subcommand
10. Are there any recommended use cases for bcachefs?
Bcachefs is primarily for multi-device filesystems.
11. How do I contribute to the bcachefs project?
Information on contributions can be found here:
[[Contributing]]
Join the [[IRC|irc]] channel and chat with other contributers
12. Do I have to reformat my bcache drive to use the new bcachefs ?
To use the caching device (cdev) with the new bcachefs, you will need to
reformat it. In principle this should not be a problem, as they can be removed
from a backing device (bdev/bcache).
If you wish to reuse the backing device (bdev/bcache), you can't this is
nolonger an option.
If you wish to use bcachefs as a filesystem you will have to format the
backing device (bdev/bcache) with the new filesystem.
14. Do I have to reformat my bcache drive to use the new bcachefs ?
To use the caching device (cdev) with the new bcachefs, you will need to
reformat it. In principle this should not be a problem, as they can be removed
from a backing device (bdev/bcache).
If you wish to reuse the backing device (bdev/bcache), you can't this is
nolonger an option.
If you wish to use bcachefs as a filesystem you will have to format the
backing device (bdev/bcache) with the new filesystem.
15. Does bcachefs still have the bcache caching functionality of block devices ?
No.
16. Where do I obtain statically linked bcachefs-tool (for use in initramfs) ?
You can either compile them yourself from source, or refer to your
distribution on how to obtain a statically linked set.
Statically linked programs have all the required dependencies compiled in. As
such, they require no external libraries at runtime. This does however
increase the size of the binary.
17. What is liburcu ?
userspace RCU (read-copy-update) library
[[http://lttng.org/urcu]]
18. I get the error "tools-util.c:16:19: fatal error: blkid.h: No such file or directory":
You might need to add
EXTRA_CFLAGS="-l/usr/include/blkid/"
or where-ever your OS stores the blkid.h file.
19. I get the error "mount(2) system call failed: Required key not available."
You need to unlock the filesystem before mounting. As a superuser, run
(substituting your drive for `/dev/sdc1`):
bcachefs unlock /dev/sdc1
If the error persists, it might be because you're using `sudo` and root's
keyring is not connected to your session. To verify, run these two commands:
sudo keyctl list @u
sudo keyctl list @s
The first one displays the keys in root's keyring, and should mention external
UUID of your bcachefs filesystem (which you can find with `bcachefs show-super
/dev/scd1`). The second one displays your session's keyring, and should mention
uid.0 (root).
If you don't see uid.0 in the output of the second command, connect root's
keyring to your session:
sudo keyctl link @u @s
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