🗂️ My Doubts After Reading VMware’s NFS Best Practices

 

1. Q: Why does VMware recommend NFS v4.1 over NFS v3 in vSphere?
   A: NFS v4.1 supports multipathing and session trunking, which improves performance and availability. NFS v3 lacks multipathing and requires multiple datastores/IPs for load sharing.

2. Q: What is the recommended network configuration for NFS traffic in ESXi?
   A: Use dedicated 10GbE or higher NICs, enable jumbo frames (MTU 9000) end‑to‑end, and isolate NFS traffic on a separate VLAN or network segment.

3. Q: How should you configure DNS and name resolution for NFS datastores?
   A: Always use consistent FQDNs or IPs across hosts. VMware recommends using IP addresses for reliability, but if DNS is used, ensure forward and reverse lookups are correct.

4. Q: What are VMware’s recommendations for NFS security?
   A: Isolate NFS traffic on a dedicated network, use firewalls to restrict access, and prefer NFS v4.1 with Kerberos authentication for secure environments.

5. Q: How does multipathing work with NFS v4.1 in vSphere?
   A: ESXi can establish multiple sessions to the same NFS datastore across different network paths, balancing load and providing failover automatically.

6. Q: What is the impact of enabling jumbo frames for NFS traffic?
   A: Jumbo frames reduce CPU overhead and improve throughput, but they must be consistently configured across ESXi hosts, switches, and storage arrays.

7. Q: How should you monitor NFS datastore performance in vSphere?
   A: Use vSphere performance charts, esxtop, and vRealize Operations to track latency, throughput, and IOPS. VMware recommends keeping NFS latency under 1ms for optimal performance.

8. Q: What are the best practices for mounting NFS datastores across multiple ESXi hosts?
   A: Ensure identical mount points and datastore names across all hosts, use consistent export paths, and configure access permissions correctly on the NFS server.

9. Q: How does vSphere HA and vMotion benefit from NFS datastores?
   A: NFS datastores allow multiple hosts to access the same files concurrently, enabling seamless VM migration (vMotion) and failover (HA) without shared block storage.

10. Q: What are VMware’s recommendations for NFS export options on the server side?
    A: Use rw,sync,no_root_squash for ESXi compatibility, restrict exports to specific ESXi host IPs, and avoid insecure unless required by legacy setups.

Ref - https://www.vmware.com/docs/vmw-best-practices-running-nfs-vmware-vsphere