Asking Ambari to use all of /dev/xvda

Hi,

I have created a 6 node cluster on AWS using Ambari to run Spark applications. Each of them have 100G of SSDs in them, and 2 of them have 200.

a lsblk on any of the nodes shows the following:

[ec2-user@sparkslave4 ~]$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
xvda 202:0 0 200G 0 disk
└─xvda1 202:1 0 5.7G 0 part /

Ambari though only uses 5.7G of that place for data nodes instead of the whole thing. Why is that? I did not change any configuration and just let the defaults take their course. I do see that root has been mounted only on part of it, but AWS seems to have done that. How do I tell Ambari to use all of /dev/xvda and not just /dev/xvda1? I have used Ambari earlier and it used to use all of the storage in the instance.

Thanks.