Using HPE Server such as DL325 Gen11 the fans were found at constant 50-60% and being very noise even without any load. Changing the cooling settings in the BIOS to “smooth Cooling” has negligible effect. In the iLO Interface there is a crucial line giving the reason
15-AHCI HD Max SystemBoard 7 1 Absent N/A N/A
This is because without a RAID controller and a direct SATA attached drive (which is all i need for a local XCP-NG install), the hard drive temperature is not available for the iLO. Thus it goes into emergency mode and keeps the fan running at high speed. Solution:
Grab the AMSD, Agentless Management Service from HPE: https://downloads.linux.hpe.com/SDR/repo/mcp/XenServer/8/x86_64/2025.06.00.00/
and install with rpm -ivh amsd-3.6.0-1867.26.xenserver8.x86_64.rpm
After few minutes the HD temperature is recognized and fans speed down.