Volume size < 20GB trigger point is 85%
Volume size 20-100GB trigger point 90%
Volume size 100-500GB trigger point 92%
Volume size 500GB -1TB trigger point 95%
Volume size > 1TB trigger point 98%
If you want to tweak these, there are flags in ONTAP that are setable.
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wafl_reclaim_threshold_t: tiny vols < 20gb
threshold = 85%
wafl_reclaim_threshold_s: small vols from 20gb to < 100gb
threshold = 90%
wafl_reclaim_threshold_m: medium vols from 100gb to < 500gb
threshold = 92%
wafl_reclaim_threshold_l: large vols from 500gb to < 1tb
threshold = 95%
wafl_reclaim_threshold_ xl: xlarge vols from 1tb up
threshold = 98%
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priv set -q diag; setflag wafl_reclaim_threshold_<x> 90; priv set;