When you create an SDDC, you can choose to have it contain medium or large SDDC appliance configurations. If you created the SDDC with a medium appliance configuration and find that you need additional management cluster resources, you can upsize the configuration to large.

By default, a new SDDC is created with medium-sized NSX Edge and vCenter Server appliances. Large-sized appliances are recommended for deployments with more than 30 hosts or 3000 VMs or in any other situation where management cluster resources might be oversubscribed. Large-sized appliances are also required if you want to Configure a Multi-Edge SDDC With Traffic Groups.

You can use a control on the SDDC Settings tab to upsize a medium-sized SDDC to a large-sized one. This change is permanent and cannot be undone. The operation incurs about an hour of SDDC downtime, and requires a vCenter re-start and an NSX failover. If there aren’t enough free resources available, the operation adds a host to the SDDC.


This operation cannot be performed while SDDC maintenance, including the addition or removal of hosts, is underway.


You must be logged in to the VMware Cloud Console at https://vmc.vmware.com/ as a user with a VMware Cloud Services Service Role of Administrator or Administrator (Delete Restricted).


  1. Log in to the VMware Cloud Console at https://vmc.vmware.com.
  2. On the card for your SDDC, click View Details and then click the Settings tab.
    The Settings page displays information about SDDC settings, pre-defined user accounts, and SDDC access via the API and PowerCLI.
  3. Expand the Management Appliances item under the SDDC section of the Settings tab to view or change the appliance size in this SDDC.
    If the appliance size is NSX_MEDIUM, you can click UPSIZE to open the Upsize management appliances dialog. To upsize the appliance to NSX_LARGE, select the checkboxes to confirm that you understand the consequences of your action, then click UPSIZE.
    The system displays a message to confirm that the requested operation has started and track its progress.