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delay.txt

Guest on 25th July 2021 05:25:58 PM

  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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