btrfs-send(8) — Linux manual page


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

NAME         top

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

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 subvolume snapshots. The stream can be consumed
       by the btrfs receive command to replicate the sent snapshot on a
       different filesystem. The command operates in two modes: full and

       All snapshots involved in one send command must be read-only, and
       this status cannot be changed as long as there’s a running send
       operation that uses the snapshot.

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

       In the incremental mode (options -p and -c), previously sent
       snapshots that are available on both the sending and receiving side
       can be used to reduce the amount of information that has to be sent
       to reconstruct the sent snapshot on a different filesystem.

       The -p <parent> option can be omitted when -c <clone-src> options are
       given, in which case btrfs send will determine a suitable parent from
       among the clone sources.

       You must not specify clone sources unless you guarantee that these
       snapshots are exactly in the same state on both sides—both for 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 is useful to
           show the differences in metadata. -q|--quiet:::: (deprecated)
           alias for global -q option -v|--verbose:: (deprecated) alias for
           global -v option

       Global options

           suppress all messages except errors

           increase output verbosity, print generated commands in a readable

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 
       If you have a bug report for this manual page, see
       This page was obtained from the project's upstream Git repository
       on 2020-09-18.  (At that time, the date of the most recent commit
       that was found in the repository was 2020-07-02.)  If you discover
       any rendering problems in this HTML version of the page, or you
       believe there is a better or more up-to-date source for the page, or
       you have corrections or improvements to the information in this
       COLOPHON (which is not part of the original manual page), send a mail

Btrfs v4.6.1                     07/14/2020                    BTRFS-SEND(8)

Pages that refer to this page: btrfs(8)btrfs-receive(8)