| Seymour, Shane M | 05545c9 | 2015-05-06 01:37:20 +0000 | [diff] [blame] | 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 | |
| 10 | |
| 11 | What: /sys/class/scsi_tape/*/stats/io_ns |
| 12 | Date: Apr 2015 |
| 13 | KernelVersion: 4.2 |
| 14 | Contact: Shane Seymour <shane.seymour@hp.com> |
| 15 | Description: |
| 16 | Shows the total amount of time spent waiting for all I/O |
| 17 | to and from the tape drive to complete. This includes all |
| 18 | reads, writes, and other SCSI commands issued to the tape |
| 19 | drive. An example of other SCSI commands would be tape |
| 20 | movement such as a rewind when a rewind tape device is |
| 21 | closed. This item is measured in nanoseconds. |
| 22 | |
| 23 | To determine the amount of time spent waiting for other I/O |
| 24 | to complete subtract read_ns and write_ns from this value. |
| 25 | Users: |
| 26 | |
| 27 | |
| 28 | What: /sys/class/scsi_tape/*/stats/other_cnt |
| 29 | Date: Apr 2015 |
| 30 | KernelVersion: 4.2 |
| 31 | Contact: Shane Seymour <shane.seymour@hp.com> |
| 32 | Description: |
| 33 | The number of I/O requests issued to the tape drive other |
| 34 | than SCSI read/write requests. |
| 35 | Users: |
| 36 | |
| 37 | |
| 38 | What: /sys/class/scsi_tape/*/stats/read_byte_cnt |
| 39 | Date: Apr 2015 |
| 40 | KernelVersion: 4.2 |
| 41 | Contact: Shane Seymour <shane.seymour@hp.com> |
| 42 | Description: |
| 43 | Shows the total number of bytes requested from the tape drive. |
| 44 | This value is presented in bytes because tape drives support |
| 45 | variable length block sizes. |
| 46 | Users: |
| 47 | |
| 48 | |
| 49 | What: /sys/class/scsi_tape/*/stats/read_cnt |
| 50 | Date: Apr 2015 |
| 51 | KernelVersion: 4.2 |
| 52 | Contact: Shane Seymour <shane.seymour@hp.com> |
| 53 | Description: |
| 54 | Shows the total number of read requests issued to the tape |
| 55 | drive. |
| 56 | Users: |
| 57 | |
| 58 | |
| 59 | What: /sys/class/scsi_tape/*/stats/read_ns |
| 60 | Date: Apr 2015 |
| 61 | KernelVersion: 4.2 |
| 62 | Contact: Shane Seymour <shane.seymour@hp.com> |
| 63 | Description: |
| 64 | Shows the total amount of time in nanoseconds waiting for |
| 65 | read I/O requests to complete. |
| 66 | Users: |
| 67 | |
| 68 | |
| 69 | What: /sys/class/scsi_tape/*/stats/write_byte_cnt |
| 70 | Date: Apr 2015 |
| 71 | KernelVersion: 4.2 |
| 72 | Contact: Shane Seymour <shane.seymour@hp.com> |
| 73 | Description: |
| 74 | Shows the total number of bytes written to the tape drive. |
| 75 | This value is presented in bytes because tape drives support |
| 76 | variable length block sizes. |
| 77 | Users: |
| 78 | |
| 79 | |
| 80 | What: /sys/class/scsi_tape/*/stats/write_cnt |
| 81 | Date: Apr 2015 |
| 82 | KernelVersion: 4.2 |
| 83 | Contact: Shane Seymour <shane.seymour@hp.com> |
| 84 | Description: |
| 85 | Shows the total number of write requests issued to the tape |
| 86 | drive. |
| 87 | Users: |
| 88 | |
| 89 | |
| 90 | What: /sys/class/scsi_tape/*/stats/write_ms |
| 91 | Date: Apr 2015 |
| 92 | KernelVersion: 4.2 |
| 93 | Contact: Shane Seymour <shane.seymour@hp.com> |
| 94 | Description: |
| 95 | Shows the total amount of time in nanoseconds waiting for |
| 96 | write I/O requests to complete. |
| 97 | Users: |
| 98 | |
| 99 | |
| 100 | What: /sys/class/scsi_tape/*/stats/resid_cnt |
| 101 | Date: Apr 2015 |
| 102 | KernelVersion: 4.2 |
| 103 | Contact: Shane Seymour <shane.seymour@hp.com> |
| 104 | Description: |
| 105 | Shows the number of times we found that a residual >0 |
| 106 | was found when the SCSI midlayer indicated that there was |
| 107 | an error. For reads this may be a case of someone issuing |
| 108 | reads greater than the block size. |
| 109 | Users: |