Start here: [URL]  This is a customer-facing document that enables you and your customer to walk-through what is needed before upgrading.  A couple of things that need further clarification:  For information on the latest recommended OneFS version in: [URL]
My customer is upgrading from OneFS 6.5.x to 7.0. How can I start preparing for this update?
Upgrade from 6.5 to 7.0, where to start?