Question about RAID controllers and hadoop

[Koert Kuipers]

Hello all,
We are considering using low end HP proliant machines (DL160s and DL180s)
for cluster nodes. However with these machines if you want to do more than 4
hard drives then HP puts in a P410 raid controller. We would configure the
RAID controller to function as JBOD, by simply creating multiple RAID
volumes with one disk. Does anyone have experience with this setup? Is it a
good idea, or am i introducing a i/o bottleneck?
Thanks for your help!
Best, Koert