What would be a reasonable configuration of disk drives in a Hadoop datanode?

A.
Four 1TB disk drives in a RAID configuration

B.
One 1TB disk drive

C.
Four 1TB disk drives in a JBOD configuration

D.
48 1.5TB disk drives in a JBOD configuration

E.
48 1.5 TB disk drives in a RAID configuration

Explanation:
http://www.cloudera.com/blog/2010/03/clouderas-support-team-shares-some-basichardware-recommendations/ (How to pick hardware for your hadoop cluster, see first bulleted
point)