btrfs-device
Manage devices in a btrfs filesystem
TLDR
Add devices
$ sudo btrfs device add /dev/sdb /dev/sdc path/to/filesystem
Remove devices$ sudo btrfs device remove /dev/sdb path/to/filesystem
Show error statistics$ sudo btrfs device stats path/to/filesystem
Scan all disks$ sudo btrfs device scan --all-devices
Show usage per device$ sudo btrfs device usage path/to/filesystem
SYNOPSIS
btrfs device command [OPTIONS] [device|path]
DESCRIPTION
btrfs device manages devices in a btrfs filesystem. It can add or remove devices, display statistics, and scan for btrfs filesystems. This enables dynamic resizing and RAID configuration changes.
PARAMETERS
add
Add one or more devices to the filesystemremove
Remove a device from the filesystemdelete
Alias for removestats
Show device error statisticsscan
Scan devices for btrfs filesystemsusage
Show detailed per-device allocation statisticsready
Check if a device is ready-d, --all-devices
Scan all devices for btrfs filesystems
CAVEATS
Removing a device requires enough space on remaining devices to hold relocated data. The filesystem must be mounted to add or remove devices. Adding devices does not automatically balance data.
HISTORY
btrfs device is part of the btrfs-progs package for managing btrfs filesystems on Linux.
SEE ALSO
btrfs(8), btrfs-balance(8), btrfs-filesystem(8)