At the Powercli cmd prompt type the following:
Connect-VIserver Servername
Locate the VM that you want to modified using:Get-VM
then use the following syntax
get-vm ServerName | set-vm -MemoryGB 4096 -NumCpu 2 -Notes "H/W modified $(Get-Date)" -confirm:$false
commands:
Get-VM
Set-VM
parameters:
MemoryMB = Specify the memory size in megabytes (MB
NumCpu = Specify the number of virtual CPUs.
Notes = Provide a description of the virtual machine. The alias of this parameter is Description
Reference:
https://www.vmware.com/support/developer/PowerCLI/PowerCLI51/html/Set-VM.html