Business Continuity

Question 1

What’s the difference between Business Continuity and Disaster Recovery?

Answer 1

Business Continuity - Minimising disruptions to business when something unexpected happens

Disaster Recovery - The architecture in place to help effectively recovery from a disaster scenario

Question 2

What’s the difference between High Availability and Fault Tolerance

Answer 2

HA - Ability to handle faults with minimal service interuptions

Fault Tolerance - Ability to handle faults without any service disruptions

Question 3

Explain RTO and RPO

Answer 3

RTO - The time it takes after a disruption to restore a service

RPO - The acceptable amount of data loss, measured in time

Question 4

Explain DR Architecture: Backup and Restore

Answer 4

Having backups that can be restored. Easy to set up, not fast or flexible

Question 5

Explain DR Architecture: Pilot Light

Answer 5

Having a powered down replicated environment as standby. Cheap way to maintain a hot site. Requires manual intervention and updating, can be slow to spin up

Question 6

Explain DR Architecture: Warm Standby

Answer 6

Having a powered up replicated environment as failover. Fast to failover, can be used for staging. Is expensive and needs to be scaled to match prod workload. Manual process to switch over.

Question 7

Explain DR Architecture: Multi-Site

Answer 7

Live secondary architecture ready to overtake prod workload, mirror of prod. Failover takes seconds or less, little intervention required. Expensive option, can be seen as wasteful