[Bug 215704] New: Trouble locating documentation related to disk read timeout /sys/block/*/device/timeout OR /sys/devices/**/timeout

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=215704

            Bug ID: 215704
           Summary: Trouble locating documentation related to disk read
                    timeout /sys/block/*/device/timeout OR
                    /sys/devices/**/timeout
           Product: Documentation
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: man-pages
          Assignee: documentation_man-pages@kernel-bugs.osdl.org
          Reporter: mjevans1983@gmail.com
        Regression: No

I've been unable to locate Documentation that matches some locations within
sysfs.

/sys/block/*/device/timeout
/sys/devices/**/timeout

They all appear to cat a value of 30.  However an initial experiment with this
value appears to diverge from assumptions I had made.

My context is related to TLER
smartctl -l scterc,${TIMEOUT_SEC}0,${TIMEOUT_SEC}0 /dev/sdX

I have a software RAID (ZFS in this case) which isn't interacting the way it
expects with underlying hardware.  I was hoping to find a manual that might
explain how the block device tunable fields such as 'timeout' are intended to
be utilized and tuned.

I didn't see anything obvious in search of text and 'reStructuredText' files
with the obvious keyword:

https://github.com/torvalds/linux/search?l=Text&p=6&q=timeout
https://github.com/torvalds/linux/search?l=reStructuredText&p=16&q=timeout

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