Cost-Effective HA/DR Solution for Antivirus System
Client Requirement
The client required a reliable, license-
compliant disaster recovery (DR) solution to protect their antivirus
system—without the use of cloud-based infrastructure or SQL Enterprise
features.
Key Challenges
- Highly restricted network and security constraints
- Limited to SQL Server Standard Edition with CAL
- No Enterprise HA/DR features available (e.g. multi-DB AGs)
- No external or cloud DR infrastructure permitted
Proposed Hybrid Architecture
Primary Site: 2-node Always On AG with
synchronous commit
DR Site: Standby node with passive AG,
activated only during DR
Log Shipping: From primary site to DR site
(asynchronous)
Failover: Auto within site, manual to DR
site with tail log restore
Technology Stack
- SQL Server Standard Edition
- Always on AG (2-node)
- Log Shipping
- Tail Log Restore for DR
Failover Strategy
Node Failure (Primary Site): Automatic
failover within AG
Full Site Failure: Manual failover to DR via
log shipping
DR Activation: Tail log recovery and bring
DB online
Business Benefits
- License Compliant – no Enterprise
dependency - Cost-Effective – avoids expensive
tooling - High Availability through Always On AG
- Reliable DR through log shipping
Strategic Impact
Delivered enterprise-grade availability and
disaster recovery within the tight constraints
of security, licensing, and budget—without
compromising reliability or maintainability.
Why KlusterFirst?
We specialize in uncovering deep-rooted performance bottlenecks and delivering high-
impact, measurable improvements in large-scale database environments.