My SYS-221H-TNR RAID5 is showing "Initializing" on my 6-disks NVME RAID5 Array in Intel VROC OptROM.  In some systems, I see "Normal", but in this system it shows "Initializing" and I left the system for days, it still has not completed.  Can you explain?

Answer: Intel VROC is Software RAID which mean it required the system to boot into OS with supported VROC driver.  When you first create 6-disks RAID5, the VROC will write metadata or raid information to each drive.  Because there is no raid controller in BIOS, so the raid state shows as normal.  Once you boot into OS, Linux md will initialize the raid, you can check it using 

# cat /proc/mdstat

# mdadm -E /dev/md126

If you reboot the system and go back into VROC setup in BIOS, you will see the state becomes "Initializing", this is normal as VROC found the state of the raid through metadata updated by Linux RAID.