Adding an individual host to a vSphere cluster in a workload domain increases the available resources. You can add multiple hosts at a time to a domain.

Prerequisites

  • Verify that a host is available in the SDDC Manager inventory. For information on commissioning hosts, see Commission Hosts.
  • Verify that the host you want to add is in an active state. See View Host Inventory.
  • Verify you have a valid vSphere license with adequate sockets available in the SDDC Manager inventory. See Add a License Key
  • Verify that the host to be added matches the configuration of the hosts already in the vSphere cluster. This allows the vSphere cluster configuration to remain balanced. If the host to be added does not match the pre-existing hosts in the vSphere cluster, the cluster will be unbalanced and a warning is displayed. The warning does not prevent the expansion and can be dismissed if needed.
  • Verify that the host you are adding has the same type of principal storage as the existing hosts in the vSphere cluster. For the management domain, the host must use vSAN for principal storage. For VI workload domains, the host can use vSAN, NFS, VMFS on FC, or vVols for principal storage. A host using NFS for principal storage will automatically use the same NFS configuration as the other hosts in the vSphere cluster. For a host using VMFS on FC, you must configure zoning, mount the associated volumes, and create the datastore on the host before adding the host to a vSphere cluster. A host using vVols for principal storage will automatically use the same vVols configuration as the other hosts in the vSphere cluster.
  • If the vSphere cluster hosts an NSX Edge cluster, you can only add new hosts with the same management, uplink, NSX Host Overlay, and NSX Edge Overlay networks (L2 uniform) as the existing hosts.
  • If the vSphere cluster to which you are adding hosts uses a static IP pool for the NSX Host Overlay Network TEPs, that pool must include enough IP addresses for the hosts you are adding.

Procedure

  1. In the navigation pane, click Inventory > Workload Domains.
  2. In the workload domains table, click the name of the workload domain that you want to expand.
  3. Click the Clusters tab.
  4. Click the name of the vSphere cluster where you want to add a host.
  5. Click Actions > Add Host.
  6. Select the cluster expansion type.
    This option only appears if the vSphere cluster hosts an NSX Edge cluster.
    Option Description
    L2 Uniform Select if all hosts you are adding to the vSphere cluster have the same management, uplink, NSX Overlay Host TEP, and NSX Edge Overlay Edge TEP networks as the existing hosts in the vSphere cluster.
    L2 non-uniform and L3 Select if any of the hosts you are adding to the vSphere cluster have different networks than the existing hosts in the vSphere cluster.
    Important: VMware Cloud Foundation does not support adding hosts to L2 non-uniform and L3 vSphere clusters that host an NSX Edge cluster.
  7. Select the host you want to add to the vSphere cluster and click Next.
    When you use the SDDC Manager UI to add a host, it must be associated with the same network pool as the other hosts in the cluster. The VMware Cloud Foundation API supports adding hosts from different network pools to workload domain clusters, if those network pools have the same VLAN ID and MTU settings.
    You can add a host with multiple active pNICs to a multi pNIC-aware cluster using the VMware Cloud Foundation API.
  8. Select the vSphere license you want to apply to the host and click Next.
  9. Review the host and license details and click Finish.
    A message indicating that the host is being added will appear. You cannot perform additional workload domain tasks until the Add Host workflow has completed.