Issues with a 40G network

Job Description:

I had a 1Gb network which I upgraded recently to 40Gbps.

I have DELL servers with ESXi7 installed.

My issues.

When I run iperf between two virtual machines, I get a bandwitch ranging from 6Gbits/sec to 10Gbits/sec.

When I copy files with scp I getting a transfer speed of about 110-120MB/s which is very far from the theorical bandwitch of 1GB/s x 4 ~ 4G/s for a 40G network.

Recently I discovered that encryption reduce transfer speed so, I setup FTP server. Transfer speed doubled with FTP. I got a transfer rate about 240-280 MB/s.

I also updated MTU to 9000 on both hosts and VMs but transfer rates are still the same.

My needs.

I am looking for an Cisco/VMWare expert who can identify and solve the issue.

I need 40G Network bandwidth as configured in Switch to be reflected in Virtual machines

I also need the transfer speed to reflect as close as possible transfer speed of 40G network (~1250 MB/s x 4).

You will need to connect remotely using TeamViewer.

This is the current architecture details:

- Cisco Nexus 9396PX Switch with 40G module

- 4 Dell PowerEdge R930 Servers (VMware ESXi7 hosts)

- NVME disks on each server

- 40 Gbps Mellanox NIC on ESXi7 hosts

- QSFP+ DAC cables to connect servers to switch

Skills: Linux, Network Administration, Cisco, System Admin, VMware

About the Client:
( 5 reviews ) SAINT DENIS, France

Project ID: #36290467

9 freelancers are bidding on average €208 for this job


Hello Dear, I am an Expert Network Engineer and I am working as Professor and Expert Consultant Network Engineer in a Multinational ISP. I have great hands-on experience for more than 10 years in various network tech More

€30 EUR in 1 day
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Hi, Let me look into this issue. I would be delighted to work on this project and resolve the issue. Thanks Ashish A.

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(50 Reviews)

Worked with all kind of servers and all panels since 2007 And currently working as linux system administrator If you need to start as soon as possible contact me And tell me more details about what you want to Tell th More

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Hi, I am Data Center Specialist having 10 years of experience in managing network and system administration. I am VMware VCP-DCV certified professional and also CCNP Certified. I have strong working experience on Vmwar More

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Hi there, How are you? I have gone through your project details. I would like to tell you that l have a great bunch of experience in Cisco, Network Administration, VMware, Linux and System Admin. For that I would requ More

€250 EUR in 8 days
(2 Reviews)

Hi there, Based on the information you have provided, it seems like you have already taken some troubleshooting steps, such as setting up an FTP server and updating the MTU to 9000 on both hosts and VMs. However, you a More

€450 EUR in 5 days
(2 Reviews)

CERTIFIED ENGINEER, EXPERT IN ENGINEERING&SCIENCE, Dear Client, I have Keenly gone through your project requirements as given in your project description. I gladly inform you that i am in possession of all clearly sta More

€250 EUR in 6 days
(0 Reviews)

I've 20+ year of experience in IT networking technology. will get your issue/setup within 2 days. The given details looks like to build a bundle of ports to run on 40G on switch side and same Nic teaming is required on More

€200 EUR in 2 days
(0 Reviews)

Hello, Am a CCIE#26611 with extensive experience in routing & switching, datacenter, virtualization, programmability & automation. Am sure I’ll be able to troubleshoot / fix your issue & review all your configuration a More

€250 EUR in 3 days
(0 Reviews)