Have you tried the RTVDSKINF, PRTDSKINF combo?
1% is 1% of total space. Of a 1.8TB system.
We reboot once a quarter to apply PTF's, OS upgrades, etc.
I did try looking for recommended PTF's for Temporary Disk Space. However the last release recommending such ptf's was 7.3. I haven't been that far behind in years.
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