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-dm-delay
-========
-
-Device-Mapper's "delay" target delays reads and/or writes
-and maps them to different devices.
-
-Parameters:
- <device> <offset> <delay> [<write_device> <write_offset> <write_delay>]
-
-With separate write parameters, the first set is only used for reads.
-Delays are specified in milliseconds.
-
-Example scripts
-===============
-[[
-#!/bin/sh
-# Create device delaying rw operation for 500ms
-echo "0 `blockdev --getsize $1` delay $1 0 500" | dmsetup create delayed
-]]
-
-[[
-#!/bin/sh
-# Create device delaying only write operation for 500ms and
-# splitting reads and writes to different devices $1 $2
-echo "0 `blockdev --getsize $1` delay $1 0 0 $2 0 500" | dmsetup create delayed
-]]