From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- Documentation/ABI/testing/sysfs-class-scsi_tape | 109 ++++++++++++++++++++++++ 1 file changed, 109 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-class-scsi_tape (limited to 'Documentation/ABI/testing/sysfs-class-scsi_tape') diff --git a/Documentation/ABI/testing/sysfs-class-scsi_tape b/Documentation/ABI/testing/sysfs-class-scsi_tape new file mode 100644 index 000000000..9be398b87 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-class-scsi_tape @@ -0,0 +1,109 @@ +What: /sys/class/scsi_tape/*/stats/in_flight +Date: Apr 2015 +KernelVersion: 4.2 +Contact: Shane Seymour +Description: + Show the number of I/Os currently in-flight between the st + module and the SCSI mid-layer. +Users: + + +What: /sys/class/scsi_tape/*/stats/io_ns +Date: Apr 2015 +KernelVersion: 4.2 +Contact: Shane Seymour +Description: + Shows the total amount of time spent waiting for all I/O + to and from the tape drive to complete. This includes all + reads, writes, and other SCSI commands issued to the tape + drive. An example of other SCSI commands would be tape + movement such as a rewind when a rewind tape device is + closed. This item is measured in nanoseconds. + + To determine the amount of time spent waiting for other I/O + to complete subtract read_ns and write_ns from this value. +Users: + + +What: /sys/class/scsi_tape/*/stats/other_cnt +Date: Apr 2015 +KernelVersion: 4.2 +Contact: Shane Seymour +Description: + The number of I/O requests issued to the tape drive other + than SCSI read/write requests. +Users: + + +What: /sys/class/scsi_tape/*/stats/read_byte_cnt +Date: Apr 2015 +KernelVersion: 4.2 +Contact: Shane Seymour +Description: + Shows the total number of bytes requested from the tape drive. + This value is presented in bytes because tape drives support + variable length block sizes. +Users: + + +What: /sys/class/scsi_tape/*/stats/read_cnt +Date: Apr 2015 +KernelVersion: 4.2 +Contact: Shane Seymour +Description: + Shows the total number of read requests issued to the tape + drive. +Users: + + +What: /sys/class/scsi_tape/*/stats/read_ns +Date: Apr 2015 +KernelVersion: 4.2 +Contact: Shane Seymour +Description: + Shows the total amount of time in nanoseconds waiting for + read I/O requests to complete. +Users: + + +What: /sys/class/scsi_tape/*/stats/write_byte_cnt +Date: Apr 2015 +KernelVersion: 4.2 +Contact: Shane Seymour +Description: + Shows the total number of bytes written to the tape drive. + This value is presented in bytes because tape drives support + variable length block sizes. +Users: + + +What: /sys/class/scsi_tape/*/stats/write_cnt +Date: Apr 2015 +KernelVersion: 4.2 +Contact: Shane Seymour +Description: + Shows the total number of write requests issued to the tape + drive. +Users: + + +What: /sys/class/scsi_tape/*/stats/write_ms +Date: Apr 2015 +KernelVersion: 4.2 +Contact: Shane Seymour +Description: + Shows the total amount of time in nanoseconds waiting for + write I/O requests to complete. +Users: + + +What: /sys/class/scsi_tape/*/stats/resid_cnt +Date: Apr 2015 +KernelVersion: 4.2 +Contact: Shane Seymour +Description: + Shows the number of times we found that a residual >0 + was found when the SCSI midlayer indicated that there was + an error. For reads this may be a case of someone issuing + reads greater than the block size. +Users: -- cgit v1.2.3