Even though "technically" you can take a customer deployed vCenter and run it on a VxRail, it is not recommended nor supported because VxRail Manager will be unaware of the fact that it is indeed running physically on the VxRail cluster itself. To VxRail Manager, the vCenter and PSC are special "service VM's" that have a higher priority and a specific purpose that VxRail Manager takes into account as it manages the power on and power off of these VM's when using the VxRail deployed vCenter. This is extremely important that VxRail Manager takes these VM's into account because they need to be considered when doing appliance maintenance tasks like appliance shutdown as an example.  If you use a customer supplied vCenter and then move it onto the VxRail cluster, VxRail Manager will treat it like any other VM and will not be able to verify its availability when doing system maintenance. This lack of control is why we don't support this deployment scenario. When you attach a VxRail cluster to an existing Customer Supplied vCenter, it's understood that the availability and maintenance of that vCenter is no longer the responsibility of VxRail Manager. And thus VxRail Manager does not account for it during appliance maintenance. If you move a customer supplied vCenter to run on a VxRail Cluster, you do so at your own risk.
Hello,  I've seen some conflicting articles, posts about what is and isn't supported when migrating VM's from an existing environment into a new VxRAIL environment (with embedded vcenter). It doesn't sound like adding any of the existing (foreign) nodes into the VxRAIL vcenter is supported. So what I'd like to do is create the VxRAIL cluster using the customer's existing external VC. This should allow for some smoother migrations that are online and if the customer's existing VC is also a VM, I would think you can just migrated that over to live on the VxRAIL at the end - is that supported or is there something that limits this from happening?  Thanks for all the advice!  -K
Online migrations between vCenters with VxRAIL