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DM_TARGET_DELAY(4)    DragonFly Kernel Interfaces Manual    DM_TARGET_DELAY(4)

NAME
     dm_target_delay - Device-mapper delay target

SYNOPSIS
     To compile this driver into the kernel, place the following lines in your
     kernel configuration file:

           device dm
           device dm_target_delay

     Alternatively, to load the driver as a module at boot time, place the
     following line in loader.conf(5):

           dm_target_delay_load="YES"

DESCRIPTION
     The dm_target_delay target for dm(4) provides I/O delay for read or both
     read and write, and maps them to specified devices, compatible with Linux
     dm-delay.  "dmsetup create" takes the following list of parameters for
     the dm_target_delay table.

           <read_device> <read_offset> <read_delay> [<write_device>
           <write_offset> <write_delay>]

     Parameters for write delay are optional.  If write parameters are not
     specified, read parameters are used for write.  In order to only delay
     read, explicitly specify 0 delay for write.

     Offsets are specified in 512 bytes sectors.  Delays are specified in
     milliseconds.

SEE ALSO
     dm(4), dmsetup(8)

HISTORY
     The dm_target_delay dm(4) target first appeared in DragonFly 4.3.

AUTHORS
     Tomohiro Kusumi <tkusumi@netbsd.org>

DragonFly 5.7-DEVELOPMENT      October 11, 2015      DragonFly 5.7-DEVELOPMENT