vSphere 5 VAAI NFS plugin for EMC VNX is available at:
Download a copy of the NFS VAAI Plugin on EMC Powerlink (http://powerlink.emc.com)
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vSphere 5 VAAI NFS plugin for NetApp is available at:
Download a copy of the NFS VAAI VIB from NetApp website:
Note: This configuration is currently only supported on 8.1 Cluster-Mode.