Is it true that on a Windows 2016 domain controller (bare metall installation), the disc write cache is turned off even if a battery-buffered RAID controller is installed and recognized by the system (by default after every reboot)?
(We don't have experience in Windows bare metall installations and there are contradictory informations on the internet)
Yes, Active Directory attempts to disable the disk write cache when the service starts. Any disk that holds a database should never have write caching enabled. That includes Exchange and SQL Server. Disk write caching should also be disabled if there is an array controller cache.