jerome_itable Lv3Posted 05 Mar 2024 16:32
  
Several factors beyond network card drivers/adapters can contribute to not achieving 10 Gbps bandwidth throughput between Windows Server VMs on your Sangfor HCI with 3 hosts. Here are some potential causes and troubleshooting steps to investigate:

1. Verify Hardware Configuration:

    Network interface card (NIC) type: Ensure all VMs and physical hosts involved in the communication have 10 Gbps capable NICs. Check the specifications of your Sangfor HCI model and the installed NICs.
    Cabling: Use Cat 6A or higher rated cables to support 10 Gbps speeds. Faulty or incompatible cables can bottleneck performance.
    Switch configuration: Verify that the switch ports connecting the hosts and VMs are configured for 10 Gbps full duplex mode. Consult your switch's documentation for specific configuration steps.

2. Explore Software Configuration:

    Virtual Switch (vSwitch) settings: Within the Sangfor HCI management interface, check the vSwitch settings for:
        MTU (Maximum Transmission Unit): Ensure it's set to 9000 bytes for optimal 10 Gbps performance.
        Teaming policy: If NIC teaming is enabled, verify the teaming mode is appropriate for your scenario (e.g., "balance-rr" for round-robin load balancing).
    Windows Server NIC driver updates: Ensure up-to-date network drivers are installed on all Windows Server VMs. Outdated drivers might not support full 10 Gbps functionality.

3. Identify Bottlenecks and Measure Performance:

    Storage performance: While unlikely the main culprit, consider if slow storage access on the Sangfor HCI is causing a bottleneck. Run storage benchmarks to assess performance.
    CPU and RAM limitations: Monitor CPU and RAM utilization on both VMs and hosts during attempted 10 Gbps transfers. High resource usage can impact network performance.
    Benchmarking tools: Use network benchmarking tools like iperf3 to measure actual achievable bandwidth between VMs. This can help isolate the issue to specific VMs or network segments.

4. Additional Considerations:

    Virtualization overhead: While minimal, virtualization can introduce some overhead and might not reach the exact 10 Gbps wire speed.
    Sangfor support: If you've exhausted the above and still encounter issues, consult Sangfor support. They can provide specific guidance and troubleshooting steps based on your Sangfor HCI model and configuration.

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