thinQmaster Virtual testing partner Adaptive practice exams that find your weak spots and drill them. Every answer explained. From $69
Enroll

thinQmaster

Find your exam

Five questions free, before you decide.

Step 1 · choose a vendor

In one of our camps? Your practice exams come with the tuition — they are on your study page already.

Cloud Computing · Foundational

Reliability Pillar

Well-architected pillar focused on workloads performing their intended function correctly and recovering quickly from failure.

Definition

Reliability principles include automatically recovering from failure, testing recovery procedures, scaling horizontally to increase aggregate availability, stopping guessing capacity and managing change through automation. Practices include multi-AZ deployments, backups and DR planning.

Example

Deploying across three AZs with health-check-driven replacement and regular DR tests.

Exam tip

Horizontal scaling and automatic recovery map to reliability; do not confuse with performance efficiency.

Related terms