Hello, I've 2 server TX2540M1 with RAID Controller SAS 6Gbit/s 1GB (D3116C) with same problem.
First server: 2 SSD 480GB Mainstream + Windows 2012 R2 Standard Domain Controller
Second server: 2 SAS 300GB + Windows 2016 Standard Domain Controller
In Raid configuration I turn on Write Back on controller.
After the OS boots the WB is changed to Write Thorouhg.
I've read on different forum that is normal behavior of OS with Active Directory installed.
But... I've more than a couple of TX1330M4 with EP400/410/420 controller with Windows 2016 Standard or Windows 2019 Standard (always with Domain Controller role) and in this case the setting remains in Write Back.
I've read about a registry key
Path: HKLM\System\CurrentControlSet\Services\NTDS\Parameters
Value: "DSA Heuristics" = 1
but I haven't tryed.
Or about CLI command on controller
/c0 set modepgctl=ignore
/c0/u0 set cache=on
not tryed too.
Anybody has any suggest how to solve the problem?
Thanks in advance
Luca