RAID5 file server build advice

[XS Janus]

^ wow 8x drives @ under 100MB/s ?

what mobo/chipset/pcie ?

E8200, Giga: Intel G33, PCIE x4 slot, 3ware 9650SE card.
Looks pretty weak to me to.
What on earth could hold it back on the writes?

I will try larger blocks test in HDtune later, cause I noticet that improves the writes a lot.