Documentation/ABI/testing/sysfs-class-scsi_tape

Source file repositories/reference/linux-study-clean/Documentation/ABI/testing/sysfs-class-scsi_tape

File Facts

System
Linux kernel
Corpus path
Documentation/ABI/testing/sysfs-class-scsi_tape
Extension
[no extension]
Size
3354 bytes
Lines
110
Domain
Support Tooling And Documentation
Bucket
Documentation
Inferred role
Support Tooling And Documentation: Documentation
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

What:           /sys/class/scsi_tape/*/stats/in_flight
Date:           Apr 2015
KernelVersion:  4.2
Contact:        Shane Seymour <shane.seymour@hp.com>
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 <shane.seymour@hp.com>
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 <shane.seymour@hp.com>
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 <shane.seymour@hp.com>
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 <shane.seymour@hp.com>
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 <shane.seymour@hp.com>
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

Annotation

Implementation Notes