Lesson Recap

• Uptime
• Downtime
• RTO
• RPO
• Disaster Recovery

Lesson Objectives

You will be able to:

• Calculate availability in terms of up and down time
• Set reasonable business metrics for RTO and RPO
• Make determinations on what types of DR plans a company needs
• Implement a DR plan

Business objectives are a great conduit to have prioritization and cost discussions with the other functions of a business. Keeping communication open and setting reasonable, realistic goals is vital. AWS has all of the tools you will need to meet these objectives, but there will still be a cost in terms of time, money and resources.

Glossary

• Force Majeure: Term describing an event or circumstance that is completely unavoidable.
• IP whitelisting: Allowing specific IP addresses only to access some resource.
• Pilot light: Old appliances such as furnaces or water heaters had a small flame that was always burning that was used to ignite a larger flame when needed.
• Regulated industries: Industries where the government sets strict rules and guidelines for data storage or operational practices.
• Uptime: The time where you application is available and correctly functioning.
• Downtime: The time where your application is not available service it's critical functions during normal business hours.
• RTO: Recovery Time Objective, or the time that your application can be down for a given incident.
• RPO: Recover Point Objective, or a measure of how long of a period that data can be lost.

Further Reading

• High availability
• GitHub Post-incident analysis
• Atlassian Incident Handbook