iscsi boot to netapp

[topspincharlie]

I am testing various ways to load RHEL on servers with no internal hard drives on luns we've created on a netapp using 1) open-iscsi capable nics, 2) ipxe, 3) dracut (RHEL6).

I really want to get ipxe to work since it's not hardware or OS dependent.

After pouring through the documents and threads it looks like iPXE should be straight forward but I am unable to get it to work properly. I believe that my dhcpd.conf file and the netapp set up properly but I am getting the following error on the client:

Could not open SAN device: Input/output error (http://ipxe.org/1d704539)
No more network devices

On the netapp we get a message that says:
ISCSI: New session from initiator iqn.2013-03.com.redhat:test18 at IP addr 10.10.10.2

I have a verified load on lun id 18 within the netapp.

Relevant part dhcpd.conf file:

Code:

allow booting;
allow bootp;
option space ipxe;
option ipxe-encap-opts code 175 = encapsulate ipxe;
option ipxe.priority code 1 = signed integer 8;
option ipxe.keep-san code 8 = unsigned integer 8;
option iscsi-initiator-iqn code 203 = string;
option ipxe.iscsi code 17 = unsigned integer 8;
.
<other ipxe option definitions>

subnet 10.10.10.10 netmask 255.255.255.0 {
}

group pxe {
.
  <subnet/domain/router/etc options>
.
  if exists user-class and option user-class = "iPXE" {
    filename "";
    option root-path "iscsi:10.10.10.1:::18:iqn.1992-08.com.netapp:sn.118061234";
    option iscsi-initiator-iqn "iqn.2013-03.com.redhat:test18";
    option ipxe.keep-san 1;
  } else {
    filename "undionly.kpxe";
  }

We know that the target and OS on the lun is good because we can boot to this lun using the NIC's open-iscli's capabilities.

Any suggestions on what we could do to troubleshoot would be greatly appreciated.

Thanks!
-Charlie