Before you can start the migration process, you must configure the vCenter Server that is associated with the NSX Data Center for vSphere as a compute manager in NSX-T.

Prerequisites

Log into the NSX for vSphere NSX Manager web interface to retrieve the settings used for vCenter Server registration. You must use the same settings. For example, if an IP is specified, use the IP, not the FQDN.

Procedure

  1. From a browser, log in with admin privileges to an NSX Manager at https://<nsx-manager-ip-address>.
  2. Select System > Fabric > Compute Managers > Add.
  3. Complete the compute manager details.
    Option Description
    Name and Description Type the name to identify the vCenter Server.

    You can optionally describe any special details such as, the number of clusters in the vCenter Server.

    FQDN or IP Address Type the FQDN or IP address of the vCenter Server.
    Type The default compute manager type is set to vCenter Server.
    HTTPS Port of Reverse Proxy The default port is 443. If you use another port, verify that the port is open on all the NSX Manager appliances.

    Set the reverse proxy port to register the compute manager in NSX-T.
    Username and Password Type the vCenter Server login credentials.
    SHA-256 Thumbprint Type the vCenter Server SHA-256 thumbprint algorithm value.
    Enable Trust Supported only on vCenter Server 7.0 and later versions.

    Enable this field to trust compute manager for authentication.
    If you left the thumbprint value blank, you are prompted to accept the server provided thumbprint.

    After you accept the thumbprint, it takes a few seconds for NSX-T Data Center to discover and register the vCenter Server resources.

    Note: If the FQDN, IP, or thumbprint of the compute manager changes after registration, edit the computer manager and enter the new values.
  4. If the progress icon changes from In progress to Not registered, perform the following steps to resolve the error.
    1. Select the error message and click Resolve. One possible error message is the following: 
      Extension already registered at CM <vCenter Server name> with id <extension ID>
    2. Enter the vCenter Server credentials and click Resolve.
      If an existing registration exists, it will be replaced.

Results

It takes some time to register the compute manager with vCenter Server and for the connection status to appear as UP.

You can click the compute manager's name to view the details, edit the compute manager, or to manage tags that apply to the compute manager.

After the vCenter Server is successfully registered, do not power off and delete the NSX Manager VM without deleting the compute manager first. Otherwise, when you deploy a new NSX Manager, you will not be able to register the same vCenter Server again. You will get the error that the vCenter Server is already registered with another NSX Manager.

Note: After a vCenter Server (VC) compute manager is successfully added, it cannot be removed if you successfully performed any of the following actions:
  • Transport nodes are prepared using VDS that is dependent on the VC.
  • Service VMs deployed on a host or a cluster in the VC using NSX service insertion.
  • You use the NSX Manager UI to deploy Edge VMs, NSX Intelligence VM, or NSX Manager nodes on a host or a cluster in the VC.

If you try to perform any of these actions and you encounter an error (for example, installation failed), you can remove the VC if you have not successfully performed any of the actions listed above.

If you have successfully prepared any transport node using VDS that is dependent on the VC or deployed any VM, you can remove the VC after you have done the following:
  • Unprepare all transport nodes. If uninstalling a transport node fails, you must force delete the transport node.
  • Undeploy all service VMs, any NSX Intelligence VM, all NSX Edge VMs and all NSX Manager nodes. The undeployment must be successful or in a failed state.
  • If an NSX Manager cluster consists of nodes deployed from the VC (manual method) and nodes deployed from the NSX Manager UI, and you had to undeploy the manually deployed nodes, then you cannot remove the VC. To sucessfully remove the VC, ensure that you re-deploy an NSX Manager node from the VC.

This restriction applies to a fresh installation of NSX-T Data Center 3.0 as well as an upgrade.