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>.
the filesystem has to be resized to fully take advantage of a
larger target device, this can be achieved with btrfsfilesystem resize <devid>:max /pathOptions
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
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)
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Btrfs v4.6.1 07/16/2016 BTRFS-REPLACE(8)