sysfs-block-dm 1.6 KB

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  1. What: /sys/block/dm-<num>/dm/name
  2. Date: January 2009
  3. KernelVersion: 2.6.29
  4. Contact: dm-devel@redhat.com
  5. Description: Device-mapper device name.
  6. Read-only string containing mapped device name.
  7. Users: util-linux, device-mapper udev rules
  8. What: /sys/block/dm-<num>/dm/uuid
  9. Date: January 2009
  10. KernelVersion: 2.6.29
  11. Contact: dm-devel@redhat.com
  12. Description: Device-mapper device UUID.
  13. Read-only string containing DM-UUID or empty string
  14. if DM-UUID is not set.
  15. Users: util-linux, device-mapper udev rules
  16. What: /sys/block/dm-<num>/dm/suspended
  17. Date: June 2009
  18. KernelVersion: 2.6.31
  19. Contact: dm-devel@redhat.com
  20. Description: Device-mapper device suspend state.
  21. Contains the value 1 while the device is suspended.
  22. Otherwise it contains 0. Read-only attribute.
  23. Users: util-linux, device-mapper udev rules
  24. What: /sys/block/dm-<num>/dm/rq_based_seq_io_merge_deadline
  25. Date: March 2015
  26. KernelVersion: 4.1
  27. Contact: dm-devel@redhat.com
  28. Description: Allow control over how long a request that is a
  29. reasonable merge candidate can be queued on the request
  30. queue. The resolution of this deadline is in
  31. microseconds (ranging from 1 to 100000 usecs).
  32. Setting this attribute to 0 (the default) will disable
  33. request-based DM's merge heuristic and associated extra
  34. accounting. This attribute is not applicable to
  35. bio-based DM devices so it will only ever report 0 for
  36. them.
  37. What: /sys/block/dm-<num>/dm/use_blk_mq
  38. Date: March 2015
  39. KernelVersion: 4.1
  40. Contact: dm-devel@redhat.com
  41. Description: Request-based Device-mapper blk-mq I/O path mode.
  42. Contains the value 1 if the device is using blk-mq.
  43. Otherwise it contains 0. Read-only attribute.