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


dm_target_delay - Device-mapper delay target


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"


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.


dm(4), dmsetup(8)


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


Tomohiro Kusumi <tkusumi@netbsd.org> DragonFly 5.7-DEVELOPMENT October 11, 2015 DragonFly 5.7-DEVELOPMENT

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