Comments on: Hidden Virtual CPU Limit Restriction in ESX 3.5

By: jcolcombe

jcolcombe — Wed, 04 Nov 2009 08:41:12 +0000

Apologies, it should have been :
/usr/bin/vimsh -n -e “/hostsvc/advopt/update Misc.RunningVCpuLimit int 192″

This sets the maximim running vCPUs to 192, from 128.
I’ve no idea on incresing max vCPUs per VM from 8.

By: Arpan

Arpan — Tue, 03 Nov 2009 15:56:37 +0000

Hello
i have made the canges for the said parameter using VMware Infrastructure client.
but after that when i have assigned 8 cpu to virtual machine and i try to start, getting a error as:

“Virtual machine has 8 virtual CPU’s, but host only supports 4. The number of virtual CPUs may be limited by the guest OS selected for the virtual machine or by the licensing of the host”

For reference i am using RHEL 5.2 64bit on guest machine. so there should not be an issue with OS

By: Arpan

Arpan — Tue, 03 Nov 2009 15:16:54 +0000

While running this command :

vmware-vim-cmd -n -e “/hostsvc/advopt/update MiscRunningVCpuLimit int 192″

getting error message as
Invalid option ‘-n’
Usage: /usr/lib/vmware/hostd/vmware-vim-cmd [options]… command [cmd_arg1] [cmd _arg2] …
Options:
-h Display this help message and exit
-v Display version information and exit
-H Host name to connect
-O Port number to connect
-U User name to use for login
-P Password to use for login
-d Show verbose debug output. (info, verbose, trivia)

Use the help command to get information on the commands available.

/usr/lib/vmware/hostd/vmware-vim-cmd help [command]

By: jcolcombe

jcolcombe — Mon, 02 Nov 2009 10:13:00 +0000

To set this within a kickstart script you can use:

vmware-vim-cmd -n -e “/hostsvc/advopt/update MiscRunningVCpuLimit int 192″

By: jason

jason — Mon, 21 Sep 2009 01:15:38 +0000

I have summoned Duncan. Hopefully he will come here and reply.

By: Arpan

Arpan — Sun, 20 Sep 2009 21:01:59 +0000

Hi Jason
it would be great if you can tell how to do that.
and when you said that is unsupported does that mean it not supported by VMware or cm will not support the changes made?

if its not supported by vmware then i am ok with it

By: jason

jason — Sun, 20 Sep 2009 20:32:56 +0000

I just read the other day there is a hidden switch to increase the number of vCPUs in ESX 3 beyond 4. It is of course unsupported and I do not know what it is though. I would bet Duncan Epping knows but won’t tell

By: Arpan

Arpan — Sun, 20 Sep 2009 17:30:26 +0000

in esx 3.5 update 4 how i can change the the max value of cpu more than 4 for vm’s.
is there any paramater which i can change on server side and will solve this issue.

By: Alan Renouf

Alan Renouf — Fri, 21 Aug 2009 07:43:54 +0000

Hi Jason, for the PowerCLI fans I have also re-created Williams script in PowerCLI: http://www.virtu-al.net/2009/08/20/powercli-number-of-vcpus-in-a-cluster/