Don't know anything about Linux RAID, but the Shuttle AK31 v3.1 board is *junk*. There are the well-known problems it has with tolerating having any memory plugged into it. In my case, after two weeks of solid work I gave up on ever getting more than a single DIMM to work reliably. This despite using exactly the same hardware configuration as one of its reviewers. Who had no trouble.
Beyond that, it's less well known that Shuttle used -cheesy- sockets for the memory, and perhaps also for the PCI slots. My own evidence: - after many experiments, got suspicious of the slots - took out the single DIMM - carefully blew any possible dust out of the slot, and visually inspected- carefully seated the DIMM, making absolutely sure it's seated properly - ran the machine - it crashed again within a minute - took out the DIMM *again* - carefully blew any possible dust out of the slot again - carefully seated the DIMM again, making absolutely sure it's seated properly - ran the machine again - machine runs fine. The second time. Had a similar experience with the PCI slots, although my evidence was less "smoking".
*Avoid* this card. *Avoid* Shuttle Technologies.
YMMV
Garry
PS - I bought the board because it could handle 4 DIMMs, unlike all the competition. I now know: when a motherboard manufacturer does something different than all the competition, but using the same chipset, BE WARY.