0001 What: /sys/class/scsi_tape/*/stats/in_flight
0002 Date: Apr 2015
0003 KernelVersion: 4.2
0004 Contact: Shane Seymour <shane.seymour@hp.com>
0005 Description:
0006 Show the number of I/Os currently in-flight between the st
0007 module and the SCSI mid-layer.
0008 Users:
0009
0010
0011 What: /sys/class/scsi_tape/*/stats/io_ns
0012 Date: Apr 2015
0013 KernelVersion: 4.2
0014 Contact: Shane Seymour <shane.seymour@hp.com>
0015 Description:
0016 Shows the total amount of time spent waiting for all I/O
0017 to and from the tape drive to complete. This includes all
0018 reads, writes, and other SCSI commands issued to the tape
0019 drive. An example of other SCSI commands would be tape
0020 movement such as a rewind when a rewind tape device is
0021 closed. This item is measured in nanoseconds.
0022
0023 To determine the amount of time spent waiting for other I/O
0024 to complete subtract read_ns and write_ns from this value.
0025 Users:
0026
0027
0028 What: /sys/class/scsi_tape/*/stats/other_cnt
0029 Date: Apr 2015
0030 KernelVersion: 4.2
0031 Contact: Shane Seymour <shane.seymour@hp.com>
0032 Description:
0033 The number of I/O requests issued to the tape drive other
0034 than SCSI read/write requests.
0035 Users:
0036
0037
0038 What: /sys/class/scsi_tape/*/stats/read_byte_cnt
0039 Date: Apr 2015
0040 KernelVersion: 4.2
0041 Contact: Shane Seymour <shane.seymour@hp.com>
0042 Description:
0043 Shows the total number of bytes requested from the tape drive.
0044 This value is presented in bytes because tape drives support
0045 variable length block sizes.
0046 Users:
0047
0048
0049 What: /sys/class/scsi_tape/*/stats/read_cnt
0050 Date: Apr 2015
0051 KernelVersion: 4.2
0052 Contact: Shane Seymour <shane.seymour@hp.com>
0053 Description:
0054 Shows the total number of read requests issued to the tape
0055 drive.
0056 Users:
0057
0058
0059 What: /sys/class/scsi_tape/*/stats/read_ns
0060 Date: Apr 2015
0061 KernelVersion: 4.2
0062 Contact: Shane Seymour <shane.seymour@hp.com>
0063 Description:
0064 Shows the total amount of time in nanoseconds waiting for
0065 read I/O requests to complete.
0066 Users:
0067
0068
0069 What: /sys/class/scsi_tape/*/stats/write_byte_cnt
0070 Date: Apr 2015
0071 KernelVersion: 4.2
0072 Contact: Shane Seymour <shane.seymour@hp.com>
0073 Description:
0074 Shows the total number of bytes written to the tape drive.
0075 This value is presented in bytes because tape drives support
0076 variable length block sizes.
0077 Users:
0078
0079
0080 What: /sys/class/scsi_tape/*/stats/write_cnt
0081 Date: Apr 2015
0082 KernelVersion: 4.2
0083 Contact: Shane Seymour <shane.seymour@hp.com>
0084 Description:
0085 Shows the total number of write requests issued to the tape
0086 drive.
0087 Users:
0088
0089
0090 What: /sys/class/scsi_tape/*/stats/write_ms
0091 Date: Apr 2015
0092 KernelVersion: 4.2
0093 Contact: Shane Seymour <shane.seymour@hp.com>
0094 Description:
0095 Shows the total amount of time in nanoseconds waiting for
0096 write I/O requests to complete.
0097 Users:
0098
0099
0100 What: /sys/class/scsi_tape/*/stats/resid_cnt
0101 Date: Apr 2015
0102 KernelVersion: 4.2
0103 Contact: Shane Seymour <shane.seymour@hp.com>
0104 Description:
0105 Shows the number of times we found that a residual >0
0106 was found when the SCSI midlayer indicated that there was
0107 an error. For reads this may be a case of someone issuing
0108 reads greater than the block size.
0109 Users:
