генерировать поток изменений между двумя снимками подтома (generate a stream of changes between two subvolume snapshots)
Имя (Name)
btrfs-send - generate a stream of changes between two subvolume
snapshots
Синопсис (Synopsis)
btrfs send [-ve] [-p <parent>] [-c <clone-src>] [-f <outfile>]
<subvol> [<subvol>...]
Описание (Description)
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 incremental.
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.
Options
-e
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.
--no-data
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
-q|--quiet
suppress all messages except errors
-v|--verbose
increase output verbosity, print generated commands in a
readable form
Статус выхода (Exit)
btrfs send returns a zero exit status if it succeeds. Non zero is
returned in case of failure.
Доступность (Availability)
btrfs is part of btrfs-progs. Please refer to the btrfs wiki
http://btrfs.wiki.kernel.org
Смотри также (See also)
mkfs.btrfs(8), btrfs-receive(8)
