Upgrading your Content Manager environment
Upgrade your Content Manager environment before upgrading your delivery and presentation environments.
About this task
Within this upgrade stage, you can perform a rolling upgrade. That is, in a scaled-out setup, you can gradually replace individual old Content Manager-related servers with new ones, running old software alongside new software without downtime. But you must have upgraded all of your Content Manager server-side software before you can start upgrading your delivery and presentation environments.
Also note that new functionality introduced in SDL Tridion Sites 9 cannot be used until the rolling upgrade of the Content Manager environment is finished. Specifically, a Page with Regions created on a SDL Tridion Sites 9 Content Manager instance cannot be opened or published on an older Content Manager instance.
This animation shows the process of performing this part of your staged upgrade. Your installation may include all, some or none of the blue items.