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https://github.com/kdave/btrfs-progs
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Signed-off-by: Nicholas D Steeves <nsteeves@gmail.com> Signed-off-by: David Sterba <dsterba@suse.com>
80 lines
2.5 KiB
Plaintext
80 lines
2.5 KiB
Plaintext
btrfs-send(8)
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=============
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NAME
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----
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btrfs-send - generate a stream of changes between two subvolume snapshots
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SYNOPSIS
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--------
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*btrfs send* [-ve] [-p <parent>] [-c <clone-src>] [-f <outfile>] <subvol> [<subvol>...]
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DESCRIPTION
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-----------
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This command will generate a stream of instructions that describe changes
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between two subvolume snapshots. The stream can be consumed by the *btrfs
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receive* command to replicate the sent snapshot on a different filesystem.
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The command operates in two modes: full and incremental.
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All snapshots involved in one send command must be read-only, and this status
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cannot be changed as long as there's a running send operation that uses the
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snapshot.
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In the full mode, the entire snapshot data and metadata will end up in the
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stream.
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In the incremental mode (options '-p' and '-c'), previously sent snapshots that
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are available on both the sending and receiving side can be used to reduce the
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amount of information that has to be sent to reconstruct the sent snapshot on a
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different filesystem.
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The '-p <parent>' option can be omitted when '-c <clone-src>' options are
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given, in which case *btrfs send* will determine a suitable parent from among
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the clone sources.
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You must not specify clone sources unless you guarantee that these snapshots
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are exactly in the same state on both sides--both for the sender and the
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receiver.
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`Options`
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-e::
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if sending multiple subvolumes at once, use the new format and omit the
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'end cmd' marker in the stream separating the subvolumes
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-p <parent>::
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send an incremental stream from 'parent' to 'subvol'
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-c <clone-src>::
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use this snapshot as a clone source for an incremental send (multiple allowed)
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-f <outfile>::
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output is normally written to standard output so it can be, for example, piped
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to btrfs receive. Use this option to write it to a file instead.
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--no-data::
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send in 'NO_FILE_DATA' mode
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+
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The output stream does not contain any file
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data and thus cannot be used to transfer changes. This mode is faster and
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is useful to show the differences in metadata.
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-v|--verbose::
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enable verbose output, print generated commands in a readable form, (each
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occurrence of this option increases the verbosity level)
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-q|--quiet::
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suppress all messages except errors
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EXIT STATUS
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-----------
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*btrfs send* returns a zero exit status if it succeeds. Non zero is
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returned in case of failure.
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AVAILABILITY
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------------
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*btrfs* is part of btrfs-progs.
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Please refer to the btrfs wiki http://btrfs.wiki.kernel.org for
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further details.
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SEE ALSO
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--------
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`mkfs.btrfs`(8),
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`btrfs-receive`(8)
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