tldr/pages/linux/bcachefs.md

bcachefs

Manage bcachefs filesystems/devices. Some subcommands such as device have their own usage documentation. More information: https://bcachefs-docs.readthedocs.io/en/latest/index.html.

• Format a partition with bcachefs:

sudo bcachefs format {{path/to/partition}}

• Mount a bcachefs filesystem:

sudo bcachefs mount {{path/to/partition}} {{path/to/mountpoint}}

• Create a RAID 0 filesystem where an SSD acts as a cache and an HDD acts as a long-term storage:

sudo bcachefs format {{[-l|--label]}} {{ssd.ssd1}} {{path/to/ssd/partition}} {{[-l|--label]}} {{hdd.hdd1}} {{path/to/hdd/partition}} --replicas 1 --foreground_target {{ssd}} --promote_target {{ssd}} --background_target {{hdd}}

• Mount a multidevice filesystem:

sudo bcachefs mount {{path/to/partition1}}:{{path/to/partition2}} {{path/to/mountpoint}}

• Display disk usage:

bcachefs fs usage {{[-h|--human-readable]}} {{path/to/mountpoint}}

• Set replicas after formatting and mounting:

sudo bcachefs set-fs-option --metadata_replicas {{2}} --data_replicas {{2}} {{path/to/partition}}

• Force bcachefs to ensure all files are replicated:

sudo bcachefs data rereplicate {{path/to/mountpoint}}

• Create a snapshot of a particular directory:

bcachefs subvolume snapshot {{path/to/directory}} {{path/to/snapshot}}