Tried to decrease the number of cores per vCPU in a Nutanix machine catalog.  However, the new machines did not have the desired change. 

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With Nutanix hypervisor we need to “Update Machines” after making changes to Provisioning Scheme via Powershell.  

1. Get output of ProvScheme for existing catalog to be updated:

2. Update catalog with correct vCPU and memory.  Paste the below script in PowerShell ISE and configure the desired vCPU, RAM, CPUCores, and the VMCpuCount

3. Get output of ProvScheme to validate desired parameters are correctly update: 

4. In Studio, right click the machine catalog and choose “Update Machines” 
5. Now we can add machines.   New machines will have desired vCPU and RAM.

**Note: step 2 there are no spaces before vCPU, RAM and CPUCores.
 

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Problem Cause

With Nutanix hypervisor, we need to “Update Machines” after making changes to Provisioning Scheme via Powershell.  MCS keeps a template machine for fast provisioning with current resource count.  “Update Machines” in Studio updates the template machine.  
 

With Nutanix hypervisor, we need to “update catalog” after making changes to Provisioning Scheme via Powershell.  MCS keeps a template machine for fast provisioning with current resource count.  “Update Machines” in Studio updates the template machine.  

https://docs.citrix.com/en-us/citrix-virtual-apps-desktops/install-configure/install-prepare/nutanix.html