linux-stable/Documentation/device-mapper/delay.txt
Tomohiro Kusumi f49e869a61 dm delay: document that offsets are specified in sectors
Only delay params are mentioned in delay.txt.
Mention offsets just like documents for linear and flakey do.

Signed-off-by: Tomohiro Kusumi <kusumi.tomohiro@gmail.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
2015-10-31 19:06:05 -04:00

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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.
Offsets are specified in sectors.
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
]]