BTRFS−REPLACE
NAME
SYNOPSIS
DESCRIPTION
SUBCOMMAND
EXAMPLES
EXIT STATUS
AVAILABILITY
SEE ALSO
NAME
btrfs-replace − replace devices managed by btrfs with other device.
SYNOPSIS
btrfs replace
DESCRIPTION
btrfs replace is used to replace btrfs managed devices with other device.
SUBCOMMAND
cancel
Cancel a running device replace operation.
start [options]
Replace device of a btrfs filesystem.
On a live filesystem, duplicate the data to the target device which is currently stored on the source device. If the source device is not available anymore, or if the −r option is set, the data is built only using the RAID redundancy mechanisms. After completion of the operation, the source device is removed from the filesystem. If the
Note
the filesystem has to be resized to fully take advantage of a larger target device; this can be achieved with btrfs filesystem resize
Options
−r
only read from
−f
force using and overwriting
A valid filesystem is assumed if a btrfs superblock is found which contains a correct checksum. Devices that are currently mounted are never allowed to be used as the
−B
no background replace.
−−enqueue
wait if there’s another exclusive operation running, otherwise continue
−K|−−nodiscard
Do not perform whole device TRIM operation on devices that are capable of that. This does not affect discard/trim operation when the filesystem is mounted. Please see the mount option discard for that in btrfs(5).
status [−1]
Print status and progress information of a running device replace operation.
Options
−1
print once instead of print continuously until the replace operation finishes (or is cancelled)
EXAMPLES
Example 1. Replacing an online drive with a bigger one
Given the following filesystem mounted at /mnt/my−vault
Label: ‘MyVault’ uuid: ae20903e−b72d−49ba−b944−901fc6d888a1
Total devices 2 FS bytes used 1TiB
devid 1 size 1TiB used 500.00GiB path /dev/sda
devid 2 size 1TiB used 500.00GiB path /dev/sdb
In order to replace /dev/sda (devid 1) with a bigger drive located at /dev/sdc you would run the following:
btrfs replace start 1 /dev/sdc /mnt/my−vault/
You can monitor progress via:
btrfs replace status /mnt/my−vault/
After the replacement is complete, as per the docs at btrfs−filesystem(8) in order to use the entire storage space of the new drive you need to run:
btrfs filesystem resize 1:max /mnt/my−vault/
EXIT STATUS
btrfs replace returns a zero exit status if it succeeds. Non zero is returned in case of failure.
AVAILABILITY
btrfs is part of btrfs−progs. Please refer to the btrfs wiki http://btrfs.wiki.kernel.org for further details.
SEE ALSO
mkfs.btrfs(8), btrfs−device(8), btrfs−filesystem(8),