Auto-configure p4pcm.pl '-t{low|high}' thresholds per available storage.
The Proxy Cache maintainer script currently requires manual configuration
of the crontab entry, configuring `-tlow` and '-thigh` thresholds. A
good manual practice is to configure these thresholds to correspond to
something like 97% and 92% available storage, so that the proxy space
available oscilates between those numbers, keeping the cache largely full
(for optimum benefit) but never filling up.
The gist of this request is to provide an a way to look at output of,
say, df -h /p4/N/cache and based on that, determine appropriate values to
automate the manual practice.
This could result in updating the crontab entry for p4pcm.pl, adding the
'-tlow' and '-thigh' options.