Hello Community,
I'm currently planning a system upgrade from Caché (2018.1.8.766) to InterSystems IRIS (2024.1). The environment consists of one database server and three application servers connected via ECP.
I’m considering two possible upgrade approaches:
- Upgrade the application servers to IRIS first.
Since IRIS is expected to be backward-compatible with Caché over ECP, the database server would remain on Caché temporarily. - Upgrade the database server first,
followed by upgrading the application servers, as they don’t store data.
Could you please advise on the recommended approach