Open Stack

A question related to standing up cloud infrastructure for running Hadoop/HDFS.

We are building up an infrastructure using Openstack which has its own
storage management redundancy.

We are planning to use Openstack to instantiate Hadoop nodes (HDFS,
M/R tasks, Hive, HBase)
on demand.

The problem is that HDFS by design creates three copies of the data,
so there is a 4x times redundancy
which we would prefer to avoid.

I am asking here if anyone has had a similar case and if anyone has
had any helpful solution to recommend.

Thank you in advance,
Edmon