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Documentation / device-mapper / delay.txt




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Based on kernel version 3.15.4. Page generated on 2014-07-07 09:00 EST.

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