I'm working with a client who is considering upgrading from their current SDL Web 8.5 system.
We are currently considering whether to:
- Do a normal staged upgrade (using parallel infrastructure alongside the existing environments and completely separate (but upgraded) databases), or
- Do a rolling upgrade, where the new (parallel) Tridion Sites 9.x servers will point to the same (upgraded) databases as the existing SDL Web 8.5 servers.
We're not sure at this point whether to upgrade to Tridion Sites 9.0 or to hold on for the upcoming release of Tridion Sites 9.1.
My question.... Will it be possible to do a rolling upgrade (where both the old system and the new one point to the same (upgraded) databases) if the client wants to go from SDL Web 8.5 to Tridion Sites 9.1? Or is rolling upgrades only available for the last 'point release' - for example, 9.1 can only use rolling upgrades when upgrading from Sites 9.0?
The Tridion Sites 9.0 documentation is vague on this, but obviously the Tridion Sites 9.1 documentation isn't out yet.