Documentation / device-mapper / delay.txt

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Based on kernel version 3.9. Page generated on 2013-05-02 22:56 EST.

	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
	]]

• [ device-mapper ]
• cache-policies.txt
• cache.txt
• delay.txt
• dm-crypt.txt
• dm-flakey.txt
• dm-io.txt
• dm-log.txt
• dm-queue-length.txt
• dm-raid.txt
• dm-service-time.txt
• dm-uevent.txt
• kcopyd.txt
• linear.txt
• persistent-data.txt
• snapshot.txt
• striped.txt
• thin-provisioning.txt
• verity.txt
• zero.txt
•