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+btrfs-replace - replace devices managed by btrfs with other device.
+*btrfs replace* <subcommand> <args>
+*btrfs replace* is used to replace btrfs managed devices with other device.
+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
+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>.
+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`
+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
+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>.
+no background replace.
+*status* [-1] <mount_point>::
+Print status and progress information of a running device replace operation.
+print once instead of print continuously until the replace
+operation finishes (or is cancelled)
+*btrfs replace* returns a zero exit status if it succeeds. Non zero is
+returned in case of failure.
+*btrfs* is part of btrfs-progs.
+Please refer to the btrfs wiki http://btrfs.wiki.kernel.org for