bcachefs

Format a partition with bcachefs

$ sudo bcachefs format [path/to/partition]

$ sudo bcachefs mount [path/to/partition] [path/to/mountpoint]

$ sudo bcachefs format -l ssd.ssd1 [path/to/ssd] -l hdd.hdd1 [path/to/hdd] --replicas 1 --foreground_target ssd --promote_target ssd --background_target hdd

$ sudo bcachefs mount [path/to/partition1]:[path/to/partition2] [path/to/mountpoint]

$ bcachefs fs usage -h [path/to/mountpoint]

$ sudo bcachefs set-fs-option --metadata_replicas [2] --data_replicas [2] [path/to/partition]

$ sudo bcachefs data rereplicate [path/to/mountpoint]

$ bcachefs subvolume snapshot [path/to/directory] [path/to/snapshot]

bcachefs command [options] [arguments]

bcachefs is a next-generation copy-on-write filesystem for Linux that combines features of btrfs and ZFS with the performance characteristics of bcache. It provides checksumming, compression, encryption, snapshots, and multi-device support.
The filesystem supports tiered storage with automatic data movement between fast (SSD) and slow (HDD) devices, making it suitable for hybrid storage configurations.

format

Create a new bcachefs filesystem

Mount a bcachefs filesystem

Display filesystem disk usage

Manage devices in a filesystem

Manage subvolumes and snapshots

Ensure all data meets replication requirements

Change filesystem options

bcachefs was merged into the Linux kernel in version 6.7. Older kernels require external module compilation. The filesystem is still under active development; keep backups of important data.

bcachefs was developed by Kent Overstreet, who also created bcache. Development began around 2015 as an evolution of bcache into a full-fledged filesystem. It was merged into mainline Linux in 2023.

bcachefs-device(8), mount(8), btrfs(8)