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			       [<flush_device> <flush_offset> <flush_delay>]]
10
11With separate write parameters, the first set is only used for reads.
12Offsets are specified in sectors.
13Delays are specified in milliseconds.
14
15Example scripts
16===============
17[[
18#!/bin/sh
19# Create device delaying rw operation for 500ms
20echo "0 `blockdev --getsz $1` delay $1 0 500" | dmsetup create delayed
21]]
22
23[[
24#!/bin/sh
25# Create device delaying only write operation for 500ms and
26# splitting reads and writes to different devices $1 $2
27echo "0 `blockdev --getsz $1` delay $1 0 0 $2 0 500" | dmsetup create delayed
28]]
29