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Yep I have same understanding as yours.
As you may aware, Chris Wahl has a blog post on NFS with LBT NFS on vSphere Part 4 – Technical Deep Dive on Load Based Teaming - Wahl Network
As he covered in his blog post series, if you want to load balance the NFS (NFS use multiple vmnic uplinks) you would need multiple IP addresses for the VMKs.
If the VMKs are in one subnet, NFS uses only one vmnic uplink and will use the other uplink for failover (high availability) or when you use LBT and the vmnic is over 75% utilisation.
The NFS will only able to get up to 10G (1 vmnic) maximum.
If you would like NFS to use both vmnic uplinks you would need VMKs on multiple subnets.
To apply network control, bandwidth allocation, limit for your vmk vmnics (e.g. make sure vMotion and FT do not eat all the available bandwidth) you would want to use NIOC as mentioned earlier.
Also covered in this blog post Using both Storage I/O Control & Network I/O Control for NFS - VMware vSphere Blog
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