BTRFS-SEND(8)                   Btrfs Manual                   BTRFS-SEND(8)

NAME         top

       btrfs-send - generate a stream of changes between two subvolumes

SYNOPSIS         top

       btrfs send [-ve] [-p <parent>] [-c <clone-src>] [-f <outfile>]
       <subvol> [<subvol>...]

DESCRIPTION         top

       This command will generate a stream of instructions that describe
       changes between two subvolumes. The stream can be consumed by the
       btrfs receive command to replicate the sent subvolume on a different
       filesystem. The command operates in two modes: full and incremental.

       All subvolumes involved in one send command must be read-only (ie.
       the read-only snapshots and this status cannot be changed if there’s
       a running send operation that uses the subvolume).

       In the full mode, the entire subvolume data and metadata will end up
       in the stream.

       In the incremental mode (options -p and -c), there can be one or more
       parent subvolumes that will establish the base for determining the
       changes. The final stream will be smaller compared to the full mode.

       It is allowed to omit the -p <parent> option when -c <clone-src>
       options are given, in which case btrfs send will determine a suitable
       parent among the clone sources itself.

       You must not specify clone sources unless you guarantee that these
       snapshots are exactly in the same state on both sides, the sender and
       the receiver.


           if sending multiple subvolumes at once, use the new format and
           omit the end cmd marker in the stream separating the subvolumes

       -p <parent>
           send an incremental stream from parent to subvol

       -c <clone-src>
           use this snapshot as a clone source for an incremental send
           (multiple allowed)

       -f <outfile>
           output is normally written to standard output so it can be, for
           example, piped to btrfs receive. Use this option to write it to a
           file instead.

           send in NO_FILE_DATA mode

           The output stream does not contain any file data and thus cannot
           be used to transfer changes. This mode is faster and useful to
           show the differences in metadata.

           enable verbose output, print generated commands in a readable
           form, (each occurrence of this option increases the verbosity

           suppress all messages except errors

EXIT STATUS         top

       btrfs send 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-receive(8)

COLOPHON         top

       This page is part of the btrfs-progs (btrfs filesystem tools)
       project.  Information about the project can be found at 
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Btrfs v4.6.1                     03/12/2017                    BTRFS-SEND(8)