tldr/pages/linux/bcachefs.md

bcachefs

Manage bcachefs filesystems/devices. More information: https://bcachefs.org/bcachefs-principles-of-operation.pdf.

• 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 --label=ssd.ssd1 {{path/to/ssd/partition}} --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 --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}}

• Display help:

bcachefs