[6.9.2] emhttpd: read SMART keeps disks spin up

Dear all,

I've been trying to figure out why 2 of my disks keep awake: (No docker/VM running, Tunable (md_write_method): is auto)

1. Fall back to 6.9.1: noticed that the WebUI shows the disk already spin down, but in reality the disks are still spinning.
2. Upgrade to 6.9.2/6.10.0-rc1, shows the spin up/down correctly, but disks keep reading SMART to awake disks, see pic 2.
3. https://forums.unraid.net/topic/106508-advanced-disk-spindown/, I also tried this solution. it didi not help.

my findings:

1. 2 spin up disks are HGST 4tb, format in GPT, see pic 4.
2. 2 spin down disks are Toshiba 1TB, format in MBR, see pic 3.

this is all my findings, really struggled by this issue for a long time, not sure if Unraid is good solution any more.

could anyone gives some suggestions how to troubleshoot? any other NAS solution to recommend?

pic 1: 2 Hitachi disks keeps UP all the time.

Pic 2: Disks keep reading SMART