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

NAME         top

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

SYNOPSIS         top

       btrfs replace <subcommand> <args>

DESCRIPTION         top

       btrfs replace is used to replace btrfs managed devices with other

SUBCOMMAND         top

       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>.

               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

               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)

               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>.

               no background replace.

       status [-1] <mount_point>
           Print status and progress information of a running device replace


               print once instead of print continuously until the replace
               operation finishes (or is cancelled)

EXIT STATUS         top

       btrfs replace returns a zero exit status if it succeeds. Non zero is
       returned in case of failure.

AVAILABILITY         top

       btrfs is part of btrfs-progs. Please refer to the btrfs wiki for further details.

SEE ALSO         top

       mkfs.btrfs(8), btrfs-device(8),

COLOPHON         top

       This page is part of the btrfs-progs (btrfs filesystem tools)
       project.  Information about the project can be found at 
       If you have a bug report for this manual page, see
       This page was obtained from the project's upstream Git repository
       on 2018-10-29.  (At that time, the date of the most recent commit
       that was found in the repository was 2018-08-06.)  If you discover
       any rendering problems in this HTML version of the page, or you
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       you have corrections or improvements to the information in this
       COLOPHON (which is not part of the original manual page), send a mail

Btrfs v4.6.1                     04/12/2018                 BTRFS-REPLACE(8)

Pages that refer to this page: btrfs(8)btrfs-device(8)