Connecting to a DELL MD3000i is no trivial matter with Linux. First, you need to ensure that you have the DKMS package installed.
>yum -y install dkms
>yum -y install iscsi-initiator-utils
>yum -y install gcc
>yum -y install kernel-devel
>yum -y install sgpio
>yum -y install sg3_utils
Now you can install the Dell Tools and finish configuring your SAN.