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