sysfs-class-scsi_tape 3.3 KB

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  1. What: /sys/class/scsi_tape/*/stats/in_flight
  2. Date: Apr 2015
  3. KernelVersion: 4.2
  4. Contact: Shane Seymour <shane.seymour@hp.com>
  5. Description:
  6. Show the number of I/Os currently in-flight between the st
  7. module and the SCSI mid-layer.
  8. Users:
  9. What: /sys/class/scsi_tape/*/stats/io_ns
  10. Date: Apr 2015
  11. KernelVersion: 4.2
  12. Contact: Shane Seymour <shane.seymour@hp.com>
  13. Description:
  14. Shows the total amount of time spent waiting for all I/O
  15. to and from the tape drive to complete. This includes all
  16. reads, writes, and other SCSI commands issued to the tape
  17. drive. An example of other SCSI commands would be tape
  18. movement such as a rewind when a rewind tape device is
  19. closed. This item is measured in nanoseconds.
  20. To determine the amount of time spent waiting for other I/O
  21. to complete subtract read_ns and write_ns from this value.
  22. Users:
  23. What: /sys/class/scsi_tape/*/stats/other_cnt
  24. Date: Apr 2015
  25. KernelVersion: 4.2
  26. Contact: Shane Seymour <shane.seymour@hp.com>
  27. Description:
  28. The number of I/O requests issued to the tape drive other
  29. than SCSI read/write requests.
  30. Users:
  31. What: /sys/class/scsi_tape/*/stats/read_byte_cnt
  32. Date: Apr 2015
  33. KernelVersion: 4.2
  34. Contact: Shane Seymour <shane.seymour@hp.com>
  35. Description:
  36. Shows the total number of bytes requested from the tape drive.
  37. This value is presented in bytes because tape drives support
  38. variable length block sizes.
  39. Users:
  40. What: /sys/class/scsi_tape/*/stats/read_cnt
  41. Date: Apr 2015
  42. KernelVersion: 4.2
  43. Contact: Shane Seymour <shane.seymour@hp.com>
  44. Description:
  45. Shows the total number of read requests issued to the tape
  46. drive.
  47. Users:
  48. What: /sys/class/scsi_tape/*/stats/read_ns
  49. Date: Apr 2015
  50. KernelVersion: 4.2
  51. Contact: Shane Seymour <shane.seymour@hp.com>
  52. Description:
  53. Shows the total amount of time in nanoseconds waiting for
  54. read I/O requests to complete.
  55. Users:
  56. What: /sys/class/scsi_tape/*/stats/write_byte_cnt
  57. Date: Apr 2015
  58. KernelVersion: 4.2
  59. Contact: Shane Seymour <shane.seymour@hp.com>
  60. Description:
  61. Shows the total number of bytes written to the tape drive.
  62. This value is presented in bytes because tape drives support
  63. variable length block sizes.
  64. Users:
  65. What: /sys/class/scsi_tape/*/stats/write_cnt
  66. Date: Apr 2015
  67. KernelVersion: 4.2
  68. Contact: Shane Seymour <shane.seymour@hp.com>
  69. Description:
  70. Shows the total number of write requests issued to the tape
  71. drive.
  72. Users:
  73. What: /sys/class/scsi_tape/*/stats/write_ms
  74. Date: Apr 2015
  75. KernelVersion: 4.2
  76. Contact: Shane Seymour <shane.seymour@hp.com>
  77. Description:
  78. Shows the total amount of time in nanoseconds waiting for
  79. write I/O requests to complete.
  80. Users:
  81. What: /sys/class/scsi_tape/*/stats/resid_cnt
  82. Date: Apr 2015
  83. KernelVersion: 4.2
  84. Contact: Shane Seymour <shane.seymour@hp.com>
  85. Description:
  86. Shows the number of times we found that a residual >0
  87. was found when the SCSI midlayer indicated that there was
  88. an error. For reads this may be a case of someone issuing
  89. reads greater than the block size.
  90. Users: