A disaster recovery site serves as your organization's safety net when the unthinkable occurs. Selecting the right location for this critical facility involves balancing geographic separation, connectivity requirements, operational practicality, and budget constraints. The wrong choice leaves you vulnerable when you need protection most.
Geographic Separation Fundamentals
The primary purpose of a DR site is surviving events that disable your primary location. This requires sufficient geographic separation to avoid correlated disasters.
Minimum Distance Considerations
Industry guidance suggests at least 100 miles between primary and DR sites, though requirements vary by risk profile:- Natural disasters: Hurricanes, earthquakes, and floods affect regional areas. Sites should be outside the probable impact zone of events that could strike your primary location.
- Power grid dependencies: Regional power grids can fail simultaneously. Verify that sites connect to independent grid sections.
- Weather patterns: Consider seasonal storm paths, flood plains, and other recurring weather risks.
Maximum Distance Trade-offs
Greater distance provides better protection but introduces challenges:- Latency: Synchronous data replication becomes impractical beyond certain distances
- Accessibility: Staff may need to travel to the DR site during emergencies
- Time zones: Significant time differences complicate coordination
Infrastructure Requirements
A DR site must support your recovery objectives:
Power Reliability
- Redundant utility feeds from independent substations
- Generator capacity for extended outages
- Fuel supply agreements and storage capacity
- Uninterruptible power systems for seamless failover
Network Connectivity
- Multiple carrier connections via diverse paths
- Sufficient bandwidth for replication and recovery traffic
- Low-latency connections if synchronous replication is required
- Internet independence from primary site
Physical Security
- Access controls appropriate for your compliance requirements
- Environmental monitoring and protection systems
- Secure equipment areas with limited access
- Surveillance and intrusion detection
Risk Assessment Factors
Evaluate prospective locations against multiple risk categories:
Natural Hazard Analysis
- Seismic activity and earthquake probability
- Flood plain mapping and historical flood data
- Hurricane and tornado frequency
- Wildfire risk assessment
Infrastructure Stability
- Age and condition of local power grid
- Water availability for cooling systems
- Transportation access for equipment and personnel
- Telecommunications infrastructure maturity
Regulatory Environment
- Data sovereignty requirements
- Industry-specific compliance needs
- Local emergency response capabilities
- Building codes and safety standards
Operational Considerations
A DR site must be practically operable, not just theoretically compliant:
Staff Accessibility
During a disaster, personnel may need to physically operate from the DR site. Consider:- Travel time from employee locations
- Availability of nearby accommodations
- Local amenities for extended stays
- Transportation options during regional emergencies
Testing Practicality
Regular DR testing is essential, but impractical testing requirements lead to inadequate testing. Evaluate:- Cost and complexity of conducting tests
- Impact on other site operations during tests
- Ability to simulate realistic failure scenarios
Vendor and Partner Access
Third parties who support your infrastructure need access during recovery:- Proximity to technical support resources
- Availability of specialized contractors
- Equipment delivery logistics
Colocation vs. Owned Facilities
Both approaches have merits:
Colocation Advantages
- Reduced capital expenditure
- Shared infrastructure expertise
- Scalability and flexibility
- Faster deployment
Owned Facility Advantages
- Complete control over environment
- Customization for specific needs
- Potential long-term cost benefits
- No dependency on third-party operations
Hybrid Approaches
Some organizations maintain owned DR facilities for critical systems while using colocation for less sensitive workloads.Total Cost Analysis
DR site costs extend beyond obvious expenses:
Direct Costs
- Facility construction or lease payments
- Equipment procurement and maintenance
- Connectivity services
- Power consumption
Indirect Costs
- Staff travel for testing and maintenance
- Training and certification requirements
- Insurance premiums
- Ongoing compliance audits
Opportunity Costs
- Capital tied up in DR infrastructure
- Staff time dedicated to DR maintenance
- Potential business constraints from DR commitments
Making the Final Decision
Create a weighted evaluation matrix incorporating:
- Geographic risk profile relative to primary site
- Infrastructure capabilities and reliability
- Connectivity options and latency characteristics
- Operational practicality and accessibility
- Total cost of ownership over planning horizon
- Scalability for future requirements
- Compliance with regulatory obligations
The ideal DR site balances protection against probable risks with practical operability and sustainable costs. Compromising too heavily in any dimension creates vulnerabilities that may manifest at the worst possible time.