HCI VM low VM migration rate despite throughput set to 2 Gig

smolpotato Lv1Posted 2026-Jul-02 10:51

I have set my throughput to be 2 Gig, but why does my HCI VM rate is transferring at less than 50Mb? flow control i have set to 1250mb as well

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Hi
Check:
1. Actual Link Speed
2. Check the VM's Virtual NIC
3. Flow Control Configuration
4. Network Topology. Mismatches in any of these can significantly impact throughput.
5. Storage Bottlenecks
6. CPU and Memory Utilization
7. Test with a Network Benchmark
8. Verify QoS or Bandwidth Policies
Is this answer helpful?
Muhammad Abid Lv3Posted 2026-Jul-02 12:05
  
Setting the throughput to 2 Gbps only defines the maximum allowed bandwidth; it does not guarantee that speed. If your HCI VM is transferring at less than 50 Mbps, check the following:

Verify the VM NIC is negotiating at the correct speed (1G/10G).
Check for any VM QoS or bandwidth limit policies.
Test the network using iperf3 instead of file copy.
Monitor CPU, memory, and storage I/O utilization.
Check for physical network issues (NIC, switch, cables, packet loss).
Note that Flow Control (1250 MB) helps with congestion but does not increase throughput.

This covers the most common causes of low transfer speed.
Humayun Ahmed Lv4Posted 2026-Jul-02 12:09
  
Ensure the Migration/Management network is mapped to the correct physical NIC.
Verify the physical interfaces are negotiating at 10 Gbps (or the expected speed), not 1 Gbps.
Check for duplex mismatches or interface errors.
Doll Lv2Posted 2026-Jul-02 14:19
  
Setting the throughput to 2 Gbps does not ensure such speed; it merely establishes the maximum permitted bandwidth. Check the following if the transmission speed of your HCI virtual machine is less than 50 Mbps:

Make that the VM NIC is negotiating at the proper speed (1G/10G).
Look for any bandwidth limit or VM QoS policies.
Instead of copying files, use iperf3 to test the network.
Track the I/O usage of the CPU, RAM, and storage.
Examine the network's physical components (NIC, switch, cables, packet loss).
Keep in mind that while Flow Control (1250 MB) reduces congestion, it does not boost throughput.

The most frequent reasons for slow transfer speed are covered below.
Prosi Lv4Posted 2026-Jul-02 23:26
  
Hi
Check:
1. Actual Link Speed
2. Check the VM's Virtual NIC
3. Flow Control Configuration
4. Network Topology. Mismatches in any of these can significantly impact throughput.
5. Storage Bottlenecks
6. CPU and Memory Utilization
7. Test with a Network Benchmark
8. Verify QoS or Bandwidth Policies
Newbie A4 Lv2Posted 2026-Jul-03 00:08
  
Make that the right physical NIC is mapped to the Migration/Management network.
Make that the physical interfaces are negotiating at 10 Gbps (or the anticipated speed) rather than 1 Gbps.
Look for interface issues or duplex mismatches.
Sheikh_Shani Lv3Posted 2026-Jul-03 13:31
  
Ensure the Migration/Management network is mapped to the correct physical NIC.
Verify the physical interfaces are negotiating at 10 Gbps (or the expected speed), not 1 Gbps.
Check for duplex mismatches or interface errors.
Newbie A4 Lv2Posted 2026-Jul-06 13:45
  
Make that the right physical NIC is mapped to the Migration/Management network.
Make that the physical interfaces are negotiating at 10 Gbps (or the anticipated speed) rather than 1 Gbps.
Look for interface issues or duplex mismatches.

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