5 Replies Latest reply: Jun 12, 2013 12:31 PM by thomas.glodde RSS

NFS and iSCSI Traffic on the same subnet

matt090385 Novice
Currently Being Moderated



I'm looking for some advice on how I can add iSCSI to my current environment. I thought this was going to be easy however it would appear not.

Here's what I have so far.


5x physical hosts, each with...

Vmware standard (so no vDS, LACP or load balancing based on utilization)

2x nics for guest connectivity (irrelevant)

2x nics for vmkernel traffic.(Load balanced based on IP Hash, We have another datastore's which I'm not going to mention that effectively makes use of the hash) 


2x Cisco stacked 3750's set to etherchannel the above pairs of connections.

Netapp 2220 4x nics to form 1x VIF, 1xIP address, Etherchannelled together via the 3750's, Vlan tagging performed at the port level on the switch.


All the Hosts mount the above netapp as an NFS datastore


The Problem

I have the licences for snapdrive and the snap manager products so I need to move towards an iSCSI based target to effectively utilise these products with exchange and MSSQL

The luns need to come from the same Netapp filer as the NFS mounts.

I don't want to connect the luns directly from the windows machine as this would effectively then be transporting storage traffic over the guest connectivity adapters


What options do I have?


I believe I can connect the luns to vmware and then pass them through to the windows machines and snapdrive is OK with this?

Subject to question above being yes........ how can I connect the luns to vmware? I believe I have the following roadblocks.


1. My current vmware kernel arrangement has two nics load balanced via etherchannel, is it correct that I cannot bind iSCSI traffic over this interface?

2. Because the nfs and iSCSI datastores are on the same subnet I believe I cannot create another vSwitch and add another kernel port as this would be on the same subnet as my other kernels, Although I can bind my iSCSI traffic down this link I have no way of controlling nfs traffic.


Im a one man team and I need some outside perspective on this issue.



Matt Gosnell


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