You can add an ESXi host to a vSphere cluster using the SDDC Manager UI. Adding an ESXi host to a vSphere cluster in a workload domain increases the available resources. You can add multiple hosts at the same time.

When you use the SDDC Manager UI to add an ESXi host to a vSphere cluster, it uses the cluster's existing vDS for management, vMotion, vSAN, and host overlay traffic.
Note: You can add hosts to or remove hosts from multiple different vSphere clusters in parallel. For example, you add three hosts to Cluster A, and while that task is running, you can start a separate task to add (or remove) four hosts to Cluster B. See VMware Configuration Maximums for information about the maximum number of add/remove hosts tasks that you can run in parallel.

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.
  • If you choose License Now, you must have a valid vSphere license with adequate sockets available in the SDDC Manager inventory. See Add a Component License Key in the SDDC Manager UI
  • 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.
  • Different NIC enumeration is allowed.

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. Actions menu for a cluste showing Add Host option.
  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.
    Note: If the vSphere cluster includes DPU-backed hosts, you can only add DPU-backed hosts from the same vendor.
    After selecting the host, you can choose vmnics to uplinks of the vDS. The enumeration of physical nics does not need to be the same. You can use any free vmnic on the host.
  8. On the Switch Configuration page, you can view the existing networking configuration on the cluster. It shows both vDS and NSX networking. Each vDS has two uplinks in it, and you can assign any free vmnics on the host to the existing uplinks on the vDS.
  9. On the Licenses page, choose a licensing option.
    Option Description
    License Now Select the vSphere license to apply to the hosts.
    License Later ESXi hosts are deployed in evaluation mode.
    Important: After the hosts are added, you must switch to licensed mode by:
  10. Click Next.
  11. Review the host, switch configuration, and license details and click Finish.
    A message indicating that the host is being added will appear.