Disaster Recovery - Deep Dive

Question 1

What is Resiliency?

Answer 1

Ability of a workload to recover from infrastructure or service disruptions, dynamically acquire computing resources to meet demand and mitigate disruptions such as misconfigs or transient network issues.

• Resilience = Disaster Recovery & Availability
• DR = RTO & ROP
• Availability = MTBF/MTTR

Question 2

What is DR and how is it related to resiliency?

Answer 2

DR is a part of the resiliency strategy
Concerns how your workload responds when a disaster strikes.
Based on organization’s business objective - defined by RTO and RPO.

Question 3

What is a disaster?

Answer 3

Disaster - an event that causes serious negative impact to your business.

Question 4

What’s the difference between DR and Availability?

Answer 4

DR = measures objectives for one-time events
Availability = measures values over a period of time.

Availability focuses on components of a solution -e.g. multiple EC2 instances in different AZs.

DR focuses on an entire workload - e.g. standby system in a different region for failing over.