75 lines
2.4 KiB
Plaintext
75 lines
2.4 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 subvolumes
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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 subvolumes. The stream can be consumed by the *btrfs receive*
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command to replicate the sent subvolume on a different filesystem.
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The command operates in two modes: full and incremental.
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All subvolumes involved in one send command must be read-only (ie. the
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read-only snapshots and this status cannot be changed if there's a running send
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operation that uses the subvolume).
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In the full mode, the entire subvolume 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'), there can be one or more
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parent subvolumes that will establish the base for determining the changes.
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The final stream will be smaller compared to the full mode.
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It is allowed to omit the '-p <parent>' option when '-c <clone-src>' options
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are given, in which case *btrfs send* will determine a suitable parent among the
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clone sources itself.
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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, the sender and the receiver.
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`Options`
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-v::
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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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-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 outout so it can be eg. piped to
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receive, use this option to write it to a file
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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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useful to show the differences in metadata.
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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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