btrfs replace <subcommand> <args>


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

Note: this is not currently supported for RAID5/6 profiles and must use the device add/delete workaround.

It is recommended to see btrfs-device(8) for more details about btrfs device management.


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>.



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 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.



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

cancel <mount_point>

Cancel a running device replace operation.


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 \m[blue]\m[] for further details.

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