1dm-delay
 2========
 3
 4Device-Mapper's "delay" target delays reads and/or writes
 5and maps them to different devices.
 6
 7Parameters:
 8    <device> <offset> <delay> [<write_device> <write_offset> <write_delay>]
 9
10With separate write parameters, the first set is only used for reads.
11Offsets are specified in sectors.
12Delays are specified in milliseconds.
13
14Example scripts
15===============
16[[
17#!/bin/sh
18# Create device delaying rw operation for 500ms
19echo "0 `blockdev --getsz $1` delay $1 0 500" | dmsetup create delayed
20]]
21
22[[
23#!/bin/sh
24# Create device delaying only write operation for 500ms and
25# splitting reads and writes to different devices $1 $2
26echo "0 `blockdev --getsz $1` delay $1 0 0 $2 0 500" | dmsetup create delayed
27]]