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Script to change receive buffer settings on ESX virtual network adapter

Posted on 2012-09-12
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Last Modified: 2013-11-25
I have a customer that needs to change the receiver buffer settings on perhaps 100's of VM's virtual network adapters.  The VM's are all Wintel servers.  Is there a way of scripting this perhaps using a FOR command with an input file with the list of servers.  The idea is the change buffer count from 512 to 1024.  I believe these are E1000's virtual adapters.
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Question by:BigmacMc
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LVL 124
ID: 38393169
just a quick tip, I would recommend the use of the E1000 network adaptor in the virtual machine, because of it's performance, overhead on the hypervisor, and this network is generally only used because it has support built into most operating systems, before you finally build a production VM using the superior VMXNET3 network interface, which you must have VMware Tools installed to support, because tools contains the drivers.

So I would recommend replacing the E1000 with the VMXNET3.
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Author Comment

by:BigmacMc
ID: 38393189
This customer literally has thousands of VM's.  While I agree with you, the type of change you're suggesting sounds like a project for a later time.

In the short term I'm still looking for a way to change parameters on virtual adapters without having to visit each VM.
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LVL 124
ID: 38393649
Are these Windows VMs?
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Author Comment

by:BigmacMc
ID: 38394758
Yes...these are all running Windows Server of various versions; W2K3, W2K8
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LVL 124
ID: 38394834
Powerschell, Vbs scripts, registry changes should be able to complete this change. It's inside the VM, so a Windows OS function, rather than specific to VMware.

Have you checked the the variable is supported by the OS driver?
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Author Comment

by:BigmacMc
ID: 38394915
According to the network guys it is.  They've been making the changes manually, one machine at a time.  I want to automate this if possible.  Have you any examples?
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LVL 124
ID: 38394930
do you have the registry key?
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Author Comment

by:BigmacMc
ID: 38395222
No...You're indicating the change can be made via a Registry key setting?
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LVL 124
ID: 38395258
what changes have they been making and where, in the configuration of the driver?
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Accepted Solution

by:
BigmacMc earned 0 total points
ID: 39664039
There was no solution found for this, the changes were made manually.
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Author Closing Comment

by:BigmacMc
ID: 39674134
Did not follow-up. We ran out of time, the changes were made manually
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