Github user jschmerge commented on the issue:
https://github.com/apache/incubator-trafficcontrol/pull/497
The parameter is actually rather nicely documented with examples in the ATS
documentation:
https://docs.trafficserver.apache.org/en/latest/admin-guide/files/storage.config.en.html#linux-example
This patch just exposes the configuration item as a knob in traffic-ops.
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