Each installation of NSX-T Data Center requires and supports only one instance of NSX Manager. NSX Controller clusters should have three members. NSX Edge clusters should have at least two members.

If an appliance in an NSX Controller or NSX Edge cluster becomes inoperable, or you need to remove it for any reason, you can replace it with a new appliance.

Important: If you make any changes to NSX Controller or NSX Edge cluster membership you must take a cluster backup afterwards to back up the new configuration. See Backing Up and Restoring the NSX Manager.