1What: /sys/class/scsi_tape/*/stats/in_flight 2Date: Apr 2015 3KernelVersion: 4.2 4Contact: Shane Seymour <shane.seymour@hp.com> 5Description: 6 Show the number of I/Os currently in-flight between the st 7 module and the SCSI mid-layer. 8Users: 9 10 11What: /sys/class/scsi_tape/*/stats/io_ns 12Date: Apr 2015 13KernelVersion: 4.2 14Contact: Shane Seymour <shane.seymour@hp.com> 15Description: 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. 25Users: 26 27 28What: /sys/class/scsi_tape/*/stats/other_cnt 29Date: Apr 2015 30KernelVersion: 4.2 31Contact: Shane Seymour <shane.seymour@hp.com> 32Description: 33 The number of I/O requests issued to the tape drive other 34 than SCSI read/write requests. 35Users: 36 37 38What: /sys/class/scsi_tape/*/stats/read_byte_cnt 39Date: Apr 2015 40KernelVersion: 4.2 41Contact: Shane Seymour <shane.seymour@hp.com> 42Description: 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. 46Users: 47 48 49What: /sys/class/scsi_tape/*/stats/read_cnt 50Date: Apr 2015 51KernelVersion: 4.2 52Contact: Shane Seymour <shane.seymour@hp.com> 53Description: 54 Shows the total number of read requests issued to the tape 55 drive. 56Users: 57 58 59What: /sys/class/scsi_tape/*/stats/read_ns 60Date: Apr 2015 61KernelVersion: 4.2 62Contact: Shane Seymour <shane.seymour@hp.com> 63Description: 64 Shows the total amount of time in nanoseconds waiting for 65 read I/O requests to complete. 66Users: 67 68 69What: /sys/class/scsi_tape/*/stats/write_byte_cnt 70Date: Apr 2015 71KernelVersion: 4.2 72Contact: Shane Seymour <shane.seymour@hp.com> 73Description: 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. 77Users: 78 79 80What: /sys/class/scsi_tape/*/stats/write_cnt 81Date: Apr 2015 82KernelVersion: 4.2 83Contact: Shane Seymour <shane.seymour@hp.com> 84Description: 85 Shows the total number of write requests issued to the tape 86 drive. 87Users: 88 89 90What: /sys/class/scsi_tape/*/stats/write_ms 91Date: Apr 2015 92KernelVersion: 4.2 93Contact: Shane Seymour <shane.seymour@hp.com> 94Description: 95 Shows the total amount of time in nanoseconds waiting for 96 write I/O requests to complete. 97Users: 98 99 100What: /sys/class/scsi_tape/*/stats/resid_cnt 101Date: Apr 2015 102KernelVersion: 4.2 103Contact: Shane Seymour <shane.seymour@hp.com> 104Description: 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. 109Users: 110