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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 is 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>.

           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 containing a valid btrfs filesystem.

               A valid filesystem is assumed if a btrfs superblock is found which contains a correct checksum.
               Devices which 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 canceled)

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),