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BTRFS-REPLACE(8)                 Btrfs Manual                 BTRFS-REPLACE(8)

NAME
       btrfs-replace - replace devices managed by btrfs with other device.

SYNOPSIS
       btrfs replace _subcommand_ _args_

DESCRIPTION
       btrfs replace is used to replace btrfs managed devices with other
       device.

SUBCOMMAND
       cancel _mount_point_
           Cancel a running device replace operation.

       start [-Bfr] _srcdev_|_devid_ _targetdev_ _path_
           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 _srcdev_ is a numerical value, it is assumed to be the
           device id of the filesystem which is mounted at _path_, otherwise
           it is the path to the source device. If the source device is
           disconnected, from the system, you have to use the devid parameter
           format. The _targetdev_ needs to be same size or larger than the
           _srcdev_.

               Note
               the filesystem has to be resized to fully take advantage of a
               larger target device; this can be achieved with btrfs
               filesystem resize <devid>:max /path
           Options

           -r
               only read from _srcdev_ if no other zero-defect mirror exists.
               (enable this if your drive has lots of read errors, the access
               would be very slow)

           -f
               force using and overwriting _targetdev_ even if it looks like
               it contains a valid btrfs filesystem.

               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 _targetdev_.

           -B
               no background replace.

       status [-1] _mount_point_
           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
   Replacing an online drive with a bigger one
       Given the filesystem:

           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 by:

           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),

Btrfs v5.4.1                      01/09/2020                  BTRFS-REPLACE(8)
NAME | SYNOPSIS | DESCRIPTION | SUBCOMMAND | EXAMPLES | EXIT STATUS | AVAILABILITY | SEE ALSO