1*05545c92SSeymour, Shane MWhat: /sys/class/scsi_tape/*/stats/in_flight 2*05545c92SSeymour, Shane MDate: Apr 2015 3*05545c92SSeymour, Shane MKernelVersion: 4.2 4*05545c92SSeymour, Shane MContact: Shane Seymour <shane.seymour@hp.com> 5*05545c92SSeymour, Shane MDescription: 6*05545c92SSeymour, Shane M Show the number of I/Os currently in-flight between the st 7*05545c92SSeymour, Shane M module and the SCSI mid-layer. 8*05545c92SSeymour, Shane MUsers: 9*05545c92SSeymour, Shane M 10*05545c92SSeymour, Shane M 11*05545c92SSeymour, Shane MWhat: /sys/class/scsi_tape/*/stats/io_ns 12*05545c92SSeymour, Shane MDate: Apr 2015 13*05545c92SSeymour, Shane MKernelVersion: 4.2 14*05545c92SSeymour, Shane MContact: Shane Seymour <shane.seymour@hp.com> 15*05545c92SSeymour, Shane MDescription: 16*05545c92SSeymour, Shane M Shows the total amount of time spent waiting for all I/O 17*05545c92SSeymour, Shane M to and from the tape drive to complete. This includes all 18*05545c92SSeymour, Shane M reads, writes, and other SCSI commands issued to the tape 19*05545c92SSeymour, Shane M drive. An example of other SCSI commands would be tape 20*05545c92SSeymour, Shane M movement such as a rewind when a rewind tape device is 21*05545c92SSeymour, Shane M closed. This item is measured in nanoseconds. 22*05545c92SSeymour, Shane M 23*05545c92SSeymour, Shane M To determine the amount of time spent waiting for other I/O 24*05545c92SSeymour, Shane M to complete subtract read_ns and write_ns from this value. 25*05545c92SSeymour, Shane MUsers: 26*05545c92SSeymour, Shane M 27*05545c92SSeymour, Shane M 28*05545c92SSeymour, Shane MWhat: /sys/class/scsi_tape/*/stats/other_cnt 29*05545c92SSeymour, Shane MDate: Apr 2015 30*05545c92SSeymour, Shane MKernelVersion: 4.2 31*05545c92SSeymour, Shane MContact: Shane Seymour <shane.seymour@hp.com> 32*05545c92SSeymour, Shane MDescription: 33*05545c92SSeymour, Shane M The number of I/O requests issued to the tape drive other 34*05545c92SSeymour, Shane M than SCSI read/write requests. 35*05545c92SSeymour, Shane MUsers: 36*05545c92SSeymour, Shane M 37*05545c92SSeymour, Shane M 38*05545c92SSeymour, Shane MWhat: /sys/class/scsi_tape/*/stats/read_byte_cnt 39*05545c92SSeymour, Shane MDate: Apr 2015 40*05545c92SSeymour, Shane MKernelVersion: 4.2 41*05545c92SSeymour, Shane MContact: Shane Seymour <shane.seymour@hp.com> 42*05545c92SSeymour, Shane MDescription: 43*05545c92SSeymour, Shane M Shows the total number of bytes requested from the tape drive. 44*05545c92SSeymour, Shane M This value is presented in bytes because tape drives support 45*05545c92SSeymour, Shane M variable length block sizes. 46*05545c92SSeymour, Shane MUsers: 47*05545c92SSeymour, Shane M 48*05545c92SSeymour, Shane M 49*05545c92SSeymour, Shane MWhat: /sys/class/scsi_tape/*/stats/read_cnt 50*05545c92SSeymour, Shane MDate: Apr 2015 51*05545c92SSeymour, Shane MKernelVersion: 4.2 52*05545c92SSeymour, Shane MContact: Shane Seymour <shane.seymour@hp.com> 53*05545c92SSeymour, Shane MDescription: 54*05545c92SSeymour, Shane M Shows the total number of read requests issued to the tape 55*05545c92SSeymour, Shane M drive. 56*05545c92SSeymour, Shane MUsers: 57*05545c92SSeymour, Shane M 58*05545c92SSeymour, Shane M 59*05545c92SSeymour, Shane MWhat: /sys/class/scsi_tape/*/stats/read_ns 60*05545c92SSeymour, Shane MDate: Apr 2015 61*05545c92SSeymour, Shane MKernelVersion: 4.2 62*05545c92SSeymour, Shane MContact: Shane Seymour <shane.seymour@hp.com> 63*05545c92SSeymour, Shane MDescription: 64*05545c92SSeymour, Shane M Shows the total amount of time in nanoseconds waiting for 65*05545c92SSeymour, Shane M read I/O requests to complete. 66*05545c92SSeymour, Shane MUsers: 67*05545c92SSeymour, Shane M 68*05545c92SSeymour, Shane M 69*05545c92SSeymour, Shane MWhat: /sys/class/scsi_tape/*/stats/write_byte_cnt 70*05545c92SSeymour, Shane MDate: Apr 2015 71*05545c92SSeymour, Shane MKernelVersion: 4.2 72*05545c92SSeymour, Shane MContact: Shane Seymour <shane.seymour@hp.com> 73*05545c92SSeymour, Shane MDescription: 74*05545c92SSeymour, Shane M Shows the total number of bytes written to the tape drive. 75*05545c92SSeymour, Shane M This value is presented in bytes because tape drives support 76*05545c92SSeymour, Shane M variable length block sizes. 77*05545c92SSeymour, Shane MUsers: 78*05545c92SSeymour, Shane M 79*05545c92SSeymour, Shane M 80*05545c92SSeymour, Shane MWhat: /sys/class/scsi_tape/*/stats/write_cnt 81*05545c92SSeymour, Shane MDate: Apr 2015 82*05545c92SSeymour, Shane MKernelVersion: 4.2 83*05545c92SSeymour, Shane MContact: Shane Seymour <shane.seymour@hp.com> 84*05545c92SSeymour, Shane MDescription: 85*05545c92SSeymour, Shane M Shows the total number of write requests issued to the tape 86*05545c92SSeymour, Shane M drive. 87*05545c92SSeymour, Shane MUsers: 88*05545c92SSeymour, Shane M 89*05545c92SSeymour, Shane M 90*05545c92SSeymour, Shane MWhat: /sys/class/scsi_tape/*/stats/write_ms 91*05545c92SSeymour, Shane MDate: Apr 2015 92*05545c92SSeymour, Shane MKernelVersion: 4.2 93*05545c92SSeymour, Shane MContact: Shane Seymour <shane.seymour@hp.com> 94*05545c92SSeymour, Shane MDescription: 95*05545c92SSeymour, Shane M Shows the total amount of time in nanoseconds waiting for 96*05545c92SSeymour, Shane M write I/O requests to complete. 97*05545c92SSeymour, Shane MUsers: 98*05545c92SSeymour, Shane M 99*05545c92SSeymour, Shane M 100*05545c92SSeymour, Shane MWhat: /sys/class/scsi_tape/*/stats/resid_cnt 101*05545c92SSeymour, Shane MDate: Apr 2015 102*05545c92SSeymour, Shane MKernelVersion: 4.2 103*05545c92SSeymour, Shane MContact: Shane Seymour <shane.seymour@hp.com> 104*05545c92SSeymour, Shane MDescription: 105*05545c92SSeymour, Shane M Shows the number of times we found that a residual >0 106*05545c92SSeymour, Shane M was found when the SCSI midlayer indicated that there was 107*05545c92SSeymour, Shane M an error. For reads this may be a case of someone issuing 108*05545c92SSeymour, Shane M reads greater than the block size. 109*05545c92SSeymour, Shane MUsers: 110