summaryrefslogtreecommitdiffstats
path: root/Documentation/ABI/testing/sysfs-class-scsi_tape
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation/ABI/testing/sysfs-class-scsi_tape')
-rw-r--r--Documentation/ABI/testing/sysfs-class-scsi_tape109
1 files changed, 109 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-scsi_tape b/Documentation/ABI/testing/sysfs-class-scsi_tape
new file mode 100644
index 0000000000..9be398b87e
--- /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 <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
+KernelVersion: 4.2
+Contact: Shane Seymour <shane.seymour@hp.com>
+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 <shane.seymour@hp.com>
+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 <shane.seymour@hp.com>
+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 <shane.seymour@hp.com>
+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: