// Module included in the following assemblies:
//
// * post_installation_configuration/day_2_core_cnf_clusters/updating/update-rhacm-talm-overview.adoc

:_mod-docs-content-type: REFERENCE
[id="core-cluster-upgrade-scenario-selection_{context}"]
= Selecting an update scenario

[role="_abstract"]
The following decision matrix helps you determine which update scenario to use:

.Decision matrix for update scenarios
[cols="1,2,2",options="header"]
|===
|Scenario
|When to use
|Key considerations

|Z-stream
|Security patches or bug fixes needed
|Apply weekly. Minimal risk and minimal downtime.

|Y-stream
|New features required or approaching end of support
|Typically a four-month cadence. Review release notes and plan a maintenance window.

|EUS-to-EUS
|Long-term planning with staged rollouts
|18-month support. Control plane and workers can update separately. Larger version jumps require more validation.
|===
