DiverQueen,   The issue may be down to the server not supporting the OS. The R720xd looks to only support up to Server 2016, as seen here. 
Hi, I just installed a fresh Windows Server 2019 Standard on R720xd (old GSA iron). Roles fileserver + hyperv including latest patches/updates Updated the BIOS to latest version 2.9.0. Latest perc firmware/drivers SAS-RAID_Firmware_WDYTK_WN64_21.3.5-0002_A09. Checking the eventviewer for errors and I stumbled over lot's of 504 errors StorDiag - Completing a failed IOCTL request. . I'm using this server in a home setup (workgroup with 5 members) but >1000 errors a day???? Nobody seems to miss something (usings shares to user dirs.) Disabling the logs because of no reason is not my style. I like to know the reason... Anybody a clue whats'causing this Greetz
Perc H710P (R720xd) generates a lot event id 504 StorDiag on WinServer 2019