Questions about how ISCSI works in FreeNAS/Openfiler

I have some doubts about ISCSI in FreeNAS/Openfiler.

The Scenario:

1 FreeNAS or Openfiler server with:

1 ASUS P5Q Deluxe : http://www.newegg.com/Product/Product.aspx?Item=N82E16813131297&cm_re=ASUS_P5Q-_-13-131-297-_-Product
6 HD of 2 TB  Seagate 5900 RPM : http://www.newegg.com/Product/Product.aspx?Item=N82E16822148413&cm_re=2_tb_seagate-_-22-148-413-_-Product

The mobo have a Intel ICH10R chipset, the FreeNAS or Openfiler ll see it like a fake or real RAID?
In this case, the setup ll be a RAID 10 config (6TB)

The dual lan chipset are a Marvell 88E8056/88E8001 they are compatible with FreeNAS? and Openfiler?

If this motherboard wont be fully compatible with FreeNAS or Openfiler, what motherboard ll be a good option?

3 servers ll access this NAS server, so its need one more gigabit nic adapter, what is a good PCI-E 1x model? (easy to found, compatible and cheap)

I can mount the same ISCSI volume in the 3 different servers? the 6TB RAID 10 array ll be splited in 2 partitions of 3 TB, or not, i must use other share another share type, like samba?


Thanks and Happy New Year!