After upgrading my cache drive from 1.6tb Intel NVME to 3.8tb HGST NVME, fan auto control plugin is no longer ignoring NVME drive when calculating drive temp.   The new cache drive model is HGST N150 3800GB, and shows in Unraid dashboard as model UCSC-F-H38001.  Fans used to idle at 800rpm, now with min cache drive temp at 40C, a much louder 2000+rpm.   The new drive does run hot - 40C is after I switched pcie slots so open space next to drive heat sink, and also have 2000 rp