Solution Architect! Art of Disaster Recovery (DR)
Ensuring Business Continuity in a Crisis. In today’s digital-first world, High Availability (HA) and Fault Tolerance (FT) are designed to keep applications up and running. But what if an entire region goes down due to a flood or a power grid outage, or other reasons?
This is where a Disaster Recovery (DR) strategy becomes critical for ensuring business continuity. A well-designed DR plan ensures sufficient resources are available in entirely different regions, countries, or even continents.
RTO and RPO: The Foundation of DR Planning
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When planning DR, two key metrics must be defined:
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1. Recovery Time Objective (RTO): How much downtime a business can sustain without significant impact.
2. Recovery Point Objective (RPO): How much data loss a business can tolerate.
The design of RTO and RPO depends on business criticality.
For example:
A stock trading platform, railway system, or airline booking system cannot afford to lose a single data point.
DR Approaches:
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— Backup & Restore:
The least costly option with maximum RTO and RPO.
Application machine images and database snapshots should be stored in the DR site.
In the event of DR, systems are restored from backups.
— Warm Standby:
All application servers and databases exist in the DR site with low capacity.
Data is continuously synced from the primary.
In case of DR, services can be scaled up at the DR site.
Offers lower RTO and RPO compared to backup & restore.
— Multi-Site (Active-Active):
Most advanced and resilient DR strategy.
Provides zero RTO and RPO.
Equal capacity is maintained at both sites.
Traffic is distributed across regions.
In case of failure, all traffic is routed locally without downtime.
Final Thoughts:
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A robust Disaster Recovery plan is not just about technology — it’s about protecting your business, customers, and reputation. The choice between Backup & Restore, Warm Standby, and Multi-Site depends on business needs, compliance, and cost.
Ask yourself:
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How much downtime can your business afford? (RTO)
How much data loss can your business tolerate? (RPO)
:) Happy Computing
👉 Originally published on Medium: Read more