What is the recommended disk configuration for slave nodes in your Hadoop cluster with 6 x 2 TB
hard drives?

A.
RAID 10

B.
JBOD

C.
RAID 5

D.
RAID 1+0

Explanation:
Note: Let me be clear here…there are absolutely times when using a Enterprise-class storage
device makes perfect sense. But for Hadoop it is very much unnecessary, and it is these three
areas that I am going to hit as well as some others that I hope will demonstrate that Hadoop works
best with inexpensive, internal storage in JBOD mode. Some of you might say “if you lose a disk in
a JBOD configuration, you’re toast…you lose everything”. While this might be true, with Hadoop, it
isn’t. Not only do you have the benefit that JBOD gives you in speed, you have the benefit that
Hadoop Distributed File System (HDFS) negates this risk. HDFS basically creates three copies of
the data. This is a very robust way to guard against data loss due to a disk failure or node outage,
so you can eliminate the need for performance-reducing RAID.
Hadoop and Storage Area Networks