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Here is a straight forward method for partitioning, format, and mount a new volume on a Centos or RHEL system. These steps would be performed after physically (or virtually) connecting the new volume.
sudo fdisk -l
This command will display a list of volumes and their partitions on the system. You can use this to identify the new volume. You will be looking for a designation or device file similar to: /dev/xvdj
sudo fdisk [device file]
Command (m for help): c
Command (m for help): u
Command (m for help): p
This last command will display the current partitions on the volume.
Command (m for help): n
Starts process of creating a new partition.
Type p to create a primary partion
Secify the partition number (1)
Command (m for help): w
After process is complete use “w” to re-read partition table and sync.
sudo fdisk -l
Now when you run this command you will see a partition in the new volume. Write down the device file for use while mounting the volume.
sudo mkdir [directory to mount partition]
Creates a new directory on the system that the partition can be mounted to.
sudo mkfs.ext4 -L [directory to mount partition] [partition device file path]
Formats the new partition using the ext4 filesystem.
Then add the following line to the /etc/fstab file:
[partition device file path] [directory to mount partition] ext4 defaults 0 0
Source: http://www.techotopia.com/index.php/Adding_a_New_Disk_Drive_to_a_CentOS_6_System