I think I should report back. I first ran SeaTools to make sure all HDDs are good. They all passed tests. Then I messed with BIOS settings a bit, it was in default settings. I tried to enable the SATA ACHI mode, after the boot, LITE can't find any units, rescan didn't help. I disabled the SATA AHCI, still no units. Even after I reset the BIOS to default, no units.
I then tried to enable the Intel software RAID with Intel codebase (another option is Adaptec codebase), but I didn't congifure RAID in Intel RAID BIOS. After the boot, all units showed up in S/W RAID Setup page, and even resumed resyncing that I interrupted. But now at a faster speed, which is around 60000K/sec, showing time left 120min. Is this speed normal? But this whole thing still sounds strange. Is there a recommended SATA setting mode?