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Slow Performance on VMs

Posted on 2014-04-17
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Last Modified: 2014-04-17
For the past few days I have been experiencing very strange network behavior.  After some testing today, it SEEMS like there is severe network lag between my VMs and my physical devices.  All devices are on a single network.  

Virtual machines are setup to carry workloads between the physical SQL Servers and the File Server.  

I had a problem with one of the NICs on one of my ESX hosts a while ago and I was wondering if that could contribute to this.

Also, would adding Link Aggregation between the ESX hosts and the FW and Switches increase my bandwidth internally?  Is there something on the ESXi I should be looking for?  

Any insight is much appreciated.  

If you need more information please let me know and thanks in advance for your help.
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Question by:lipotech
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Andrew Hancock (VMware vExpert / EE MVE^2) earned 2000 total points
ID: 40007635
What networking interfaces are you using in the VMs, these should be VMXNET3, not the older legacy E1000.

How do you have your hosts configured, do you have more than a single host, are all VMs and hosted affected?

What do performance counters state?

Load Balancing, Teaming could help, if configured correctly, but you need to know first utilization levels on your nics?

One of the biggest management holes in vCenter of ESX is the vSphere Client can indicate that VM network traffic is causing a 1 GB Ethernet adapter to have a 99% utilization rate. But strangely, it doesn't display which kind of traffic is going across the virtual networks, where it came from or where it's going.

To learn which traffic is going across a virtual network, there's another free tool for vSphere: Xangati for ESX, a virtual appliance that tracks conversations on the virtual network. It's great for troubleshooting any virtual network issue, analyzing virtual desktop infrastructure and correlating vCenter performance stats with virtual network stats.

and then you can really check what traffic from your VMs for free is causing network issues.

It's available as a fanastic FREE download here.

http://xangati.com/try-it-free/
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