High availability, Fault tolerance, and Disaster recovery

Common Goal: High availability, Fault tolerance, and Disaster recovery

Goal: The user continues to access the application, even when things go wrong.
Common reasons for loss of availability

Network outage
Application failure
System outage
Power outage
Catastrophic disasters (Earthquakes, tsunamis, floods, tornados, etc.)

Disaster Recovery

High Availability and Fault Tolerance

⮚ Protect against data center, server, network and storage subsystem failures to keep your business running without downtime.

⮚ Highly available systems are reliable in the sense that they continue operating even when critical components fail.

⮚ They are also resilient, meaning that they can simply handle failure without service disruption or data loss, and seamlessly recover from such failure.

⮚ Azure provide high availability features such as redundancy, load balancing, auto-scaling and provisioning across Availability Zones (AZ), representing isolated parts of an Azure data center.