Migration: Moving to SAS 9.4 | SAS Support
Do I Need a Migration Guide or an Upgrade Coach?
https://support.sas.com/resources/papers/proceedings13/482-2013.pdf
Engaging SAS Consulting for Assistance
SAS Consulting services can help with planning and implementing your SAS upgrade.
For more information, see SAS Consulting. Consulting services may be recommended by SAS technical support, or by your account manager or customer loyalty representative.
If you want a MetadataServer Cluster nodes can be added at anytime or removed except for the first Metadata Server you install.