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VMWare Servers dropping packetts

Posted on 2011-09-06
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Last Modified: 2012-05-12
Hi Guys,

I have a weird and wonderful problem for you all.

Environment is as follows;

1 x  Physical Server HP DL785 G5 running ESXi 5.0
5 x Virtual Servers running Server 2008 R2
1 x HP  MSA2000 SAN

- Physical server and SAN connected via fibre.
- Virtual Servers store on SAN

Some of the virtual servers keep dropping packets randomly. I have setup a ping test from my laptop to physical server and vm's, from vm's to physical server etc. It is definitely a problem with the Virtual Server only, connections between all other devices are fine. I have attached a screenshot.

I have tried pretty much everything, deleting and rebuilding the servers from scratch. Changing the NIC types, removing one of the physical NIC's to manage the server. I have also updated the BIOS and firmware of everything in the DL785.

Please help....

 ping test from laptop to VM
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Question by:Timbobaloba
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Expert Comment

by:CWCertus1
ID: 36487383
Have you verified that the server's physical hardware is not at fault? Would it be possible to insert a separate PCI (e or x etc) NIC which could be used to test the functionality.

If that fails, could be the Motherboard of the server. If you are unfamiliar with troubleshooting methods with ESXi, you could contact the manufacurer and see what they recommend or contact VMware support.
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by:Timbobaloba
ID: 36487529
I don't think it is the MBA as I can ping and access the physical server at the same time as the virtual server is not responding. I might still install a pci nic to test and will call HP tomorrow for support but usually have a bad record with HP so not really expecting much help from them.
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LVL 124
ID: 36487545
Is it just virtual machines and not the host?

Are you using the VMXNET3 network driver for the virtual machine?

Do you have VMware Tools installed?

You do not have any load balancing or teamed physical NICs, and they are not setup correctly, e.g. configuration on the physical switch to support teaming.
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by:Timbobaloba
ID: 36487573
Hi, yes I am using VMXNET3. I did have load balancing between the 1 x 10gb nic and 1gb nic but removed the 1gb nic for troubleshooting. I have also shut down 6 of the vm's so there is only 1 online doing pretty much nothing but still get dropouts............
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LVL 124
ID: 36487588
is it pings to VM that are causing the issue, and not the host?
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Author Comment

by:Timbobaloba
ID: 36487734
No, I originally discovered the problem as my RDP sessions kept dropping out.
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Expert Comment

by:Luciano Patrão
ID: 36487959
Hi

The problem is just one VM, or all VMs?

Jail
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Author Comment

by:Timbobaloba
ID: 36488260
All VM's drop at the same time for 5-20seconds then come good again.
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Author Comment

by:Timbobaloba
ID: 36488293
oh, and yes, vmware tools are installed on all VM's. And sorry for the bad grammar and typo's, i haven't slept in days trying to get this fixed :-(
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Expert Comment

by:Luciano Patrão
ID: 36488562
Hi

Have you test this inside of the VMs? From one VM to another?

Also from host to VMs?

To do a really test try to build a inside network. Create a new vSwitch without physical NICs, add Virtual NICs to one or two VMs, then give a IP(same as the host subnet). Disable any other virtual NICs, then ping all again using that internal network.

Do you have your physical NICs from the hosts, connected to a physical Switch yes? Are you using this Switch only for hosts connections, or do you used for any other network connections?

Jail
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Expert Comment

by:arunexp
ID: 36489665
Are they all build from same image\template?? Do u have any firewall software or Antivirus software on this servers. can you stop all the AV and firewall services and see if the issue repeating..
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Expert Comment

by:xcomiii
ID: 36493860
Could it be a switch issue? What kind of switches do you have, and when you where using teaming, what settings did you set on the physical switch and on the ESXi host on the vSwitches?
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Accepted Solution

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Timbobaloba earned 0 total points
ID: 36695794
I'm not sure what the problem was exactly but I just rebuilt each server that had the problem. I Server reproduced the problem and the only thing different was that it have ALL Microsoft Updates install, where the other just has SP1 and thats it. How MS Updates can freeze a VM I really don't know but is the only thing I can think of that is a common denominator.....
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Expert Comment

by:Dr. Klahn
ID: 37130126
This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.
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