Active-passive
On This Lesson 4 topics
This lesson is planned. The outline below lists the topics it will cover. The full lesson has not been published yet.
In this lesson
describe a standby region and its failover limits.
Planned topics
- Primary serves traffic; standby receives replicated data and is activated on failure.
- Variants: cold, warm, hot standby, trading cost against RTO.
- Async replication means RPO above zero; test promotion regularly.
- Failover that is never rehearsed does not work.
Draft outline details
Demonstration
a timeline: failure detected, decision, database promotion, DNS or routing switch, cache warm-up, verification; with minutes per step for RTO.
Check your understanding
What limits RPO in active-passive?
Show answer
Replication lag of data to the standby.
Practice
Apply this lesson with the module's lab, exercises and quiz.
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