1 What: /sys/class/scsi_tape/*/stats/i 1 What: /sys/class/scsi_tape/*/stats/in_flight
2 Date: Apr 2015 2 Date: Apr 2015
3 KernelVersion: 4.2 3 KernelVersion: 4.2
4 Contact: Shane Seymour <shane.seymour@hp 4 Contact: Shane Seymour <shane.seymour@hp.com>
5 Description: 5 Description:
6 Show the number of I/Os curren 6 Show the number of I/Os currently in-flight between the st
7 module and the SCSI mid-layer. 7 module and the SCSI mid-layer.
8 Users: 8 Users:
9 9
10 10
11 What: /sys/class/scsi_tape/*/stats/i 11 What: /sys/class/scsi_tape/*/stats/io_ns
12 Date: Apr 2015 12 Date: Apr 2015
13 KernelVersion: 4.2 13 KernelVersion: 4.2
14 Contact: Shane Seymour <shane.seymour@hp 14 Contact: Shane Seymour <shane.seymour@hp.com>
15 Description: 15 Description:
16 Shows the total amount of time 16 Shows the total amount of time spent waiting for all I/O
17 to and from the tape drive to 17 to and from the tape drive to complete. This includes all
18 reads, writes, and other SCSI 18 reads, writes, and other SCSI commands issued to the tape
19 drive. An example of other SCS 19 drive. An example of other SCSI commands would be tape
20 movement such as a rewind when 20 movement such as a rewind when a rewind tape device is
21 closed. This item is measured 21 closed. This item is measured in nanoseconds.
22 22
23 To determine the amount of tim 23 To determine the amount of time spent waiting for other I/O
24 to complete subtract read_ns a 24 to complete subtract read_ns and write_ns from this value.
25 Users: 25 Users:
26 26
27 27
28 What: /sys/class/scsi_tape/*/stats/o 28 What: /sys/class/scsi_tape/*/stats/other_cnt
29 Date: Apr 2015 29 Date: Apr 2015
30 KernelVersion: 4.2 30 KernelVersion: 4.2
31 Contact: Shane Seymour <shane.seymour@hp 31 Contact: Shane Seymour <shane.seymour@hp.com>
32 Description: 32 Description:
33 The number of I/O requests iss 33 The number of I/O requests issued to the tape drive other
34 than SCSI read/write requests. 34 than SCSI read/write requests.
35 Users: 35 Users:
36 36
37 37
38 What: /sys/class/scsi_tape/*/stats/r 38 What: /sys/class/scsi_tape/*/stats/read_byte_cnt
39 Date: Apr 2015 39 Date: Apr 2015
40 KernelVersion: 4.2 40 KernelVersion: 4.2
41 Contact: Shane Seymour <shane.seymour@hp 41 Contact: Shane Seymour <shane.seymour@hp.com>
42 Description: 42 Description:
43 Shows the total number of byte 43 Shows the total number of bytes requested from the tape drive.
44 This value is presented in byt 44 This value is presented in bytes because tape drives support
45 variable length block sizes. 45 variable length block sizes.
46 Users: 46 Users:
47 47
48 48
49 What: /sys/class/scsi_tape/*/stats/r 49 What: /sys/class/scsi_tape/*/stats/read_cnt
50 Date: Apr 2015 50 Date: Apr 2015
51 KernelVersion: 4.2 51 KernelVersion: 4.2
52 Contact: Shane Seymour <shane.seymour@hp 52 Contact: Shane Seymour <shane.seymour@hp.com>
53 Description: 53 Description:
54 Shows the total number of read 54 Shows the total number of read requests issued to the tape
55 drive. 55 drive.
56 Users: 56 Users:
57 57
58 58
59 What: /sys/class/scsi_tape/*/stats/r 59 What: /sys/class/scsi_tape/*/stats/read_ns
60 Date: Apr 2015 60 Date: Apr 2015
61 KernelVersion: 4.2 61 KernelVersion: 4.2
62 Contact: Shane Seymour <shane.seymour@hp 62 Contact: Shane Seymour <shane.seymour@hp.com>
63 Description: 63 Description:
64 Shows the total amount of time 64 Shows the total amount of time in nanoseconds waiting for
65 read I/O requests to complete. 65 read I/O requests to complete.
66 Users: 66 Users:
67 67
68 68
69 What: /sys/class/scsi_tape/*/stats/w 69 What: /sys/class/scsi_tape/*/stats/write_byte_cnt
70 Date: Apr 2015 70 Date: Apr 2015
71 KernelVersion: 4.2 71 KernelVersion: 4.2
72 Contact: Shane Seymour <shane.seymour@hp 72 Contact: Shane Seymour <shane.seymour@hp.com>
73 Description: 73 Description:
74 Shows the total number of byte 74 Shows the total number of bytes written to the tape drive.
75 This value is presented in byt 75 This value is presented in bytes because tape drives support
76 variable length block sizes. 76 variable length block sizes.
77 Users: 77 Users:
78 78
79 79
80 What: /sys/class/scsi_tape/*/stats/w 80 What: /sys/class/scsi_tape/*/stats/write_cnt
81 Date: Apr 2015 81 Date: Apr 2015
82 KernelVersion: 4.2 82 KernelVersion: 4.2
83 Contact: Shane Seymour <shane.seymour@hp 83 Contact: Shane Seymour <shane.seymour@hp.com>
84 Description: 84 Description:
85 Shows the total number of writ 85 Shows the total number of write requests issued to the tape
86 drive. 86 drive.
87 Users: 87 Users:
88 88
89 89
90 What: /sys/class/scsi_tape/*/stats/w 90 What: /sys/class/scsi_tape/*/stats/write_ms
91 Date: Apr 2015 91 Date: Apr 2015
92 KernelVersion: 4.2 92 KernelVersion: 4.2
93 Contact: Shane Seymour <shane.seymour@hp 93 Contact: Shane Seymour <shane.seymour@hp.com>
94 Description: 94 Description:
95 Shows the total amount of time 95 Shows the total amount of time in nanoseconds waiting for
96 write I/O requests to complete 96 write I/O requests to complete.
97 Users: 97 Users:
98 98
99 99
100 What: /sys/class/scsi_tape/*/stats/r 100 What: /sys/class/scsi_tape/*/stats/resid_cnt
101 Date: Apr 2015 101 Date: Apr 2015
102 KernelVersion: 4.2 102 KernelVersion: 4.2
103 Contact: Shane Seymour <shane.seymour@hp 103 Contact: Shane Seymour <shane.seymour@hp.com>
104 Description: 104 Description:
105 Shows the number of times we f 105 Shows the number of times we found that a residual >0
106 was found when the SCSI midlay 106 was found when the SCSI midlayer indicated that there was
107 an error. For reads this may b 107 an error. For reads this may be a case of someone issuing
108 reads greater than the block s 108 reads greater than the block size.
109 Users: 109 Users:
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