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Diffstat (limited to 'Documentation/btrfs-send.asciidoc')
| -rw-r--r-- | Documentation/btrfs-send.asciidoc | 21 |
1 files changed, 11 insertions, 10 deletions
diff --git a/Documentation/btrfs-send.asciidoc b/Documentation/btrfs-send.asciidoc index 1c5ccbe6..ef345f68 100644 --- a/Documentation/btrfs-send.asciidoc +++ b/Documentation/btrfs-send.asciidoc @@ -3,7 +3,7 @@ btrfs-send(8) NAME ---- -btrfs-send - generate a stream of changes between two subvolumes +btrfs-send - generate a stream of changes between two subvolume snapshots SYNOPSIS -------- @@ -13,20 +13,21 @@ DESCRIPTION ----------- 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. +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 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). +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 subvolume data and metadata will end up in the +In the full mode, the entire snapshot 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. +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. 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 |