I have configured a FAS2020 at a client’s site for “Multi-switch link aggregation configuration.” Based on recommendations in the document "NetApp and VMware vSphere Storage Best Practices" TR-3749. If you look at page 34 you will see that the vif’s have been configured with alias IP addresses.
I ran into a problem with implementing this configuration. I added the alias’s to the vifs, but then the ESX hosts started showing the NFS exports twice on each host.
ESX01 Server Storage list:
NFSEXPORT 1 (1) duplicate
NFSEXPORT 2 (1) duplicate
The only way I could get the NFS exports on the ESX host to reflect a single store once again was to remove the alias.
My understanding of the purpose of adding the alias’s was to enable two ip channels for the NFS traffic to travel on between esx host and SAN controller.
I also referred to the document "Best Practices for running VMware vSphereTM on Network Attached Storage" white paper from VMware and it listed the following recommendation, 4 nics per server teamed in pairs together with each pair going to separate physical switches. (See Image #1 attached)
This is not the design I adopted. I used the following from TR-3749 pg34:
(See Image #2 attached) 2 pNics for each host cross connected to 2 stacked 3750's. As in the 1st pNic going to 1st 3750 and the 2nd pNic goes to the 2nd 3750. Because they are stacked LACP can be configured and they can be ether-channeled together.
Which one is better/right method?