Building a High-Availability Storage with Synology
Build a High-Availability Storage Environment with Synology
The business world today depends on continuous access to data. Storage infrastructure is critical for organisations to maintain employee productivity and business services, including file sharing, virtual machines, Microsoft 365 backups, and surveillance systems. Even a brief interruption can negatively impact customer service, delay projects, and lead to financial losses.
As businesses become increasingly reliant on digital infrastructure, eliminating single points of failure has become a priority. One of the most effective ways to achieve this is by building a high-availability (HA) storage environment.
Synology offers High Availability (SHA), a solution that enables organisations to build resilient storage environments that minimise downtime and ensure continuous access to critical business services.
Why High Availability Matters
Many organisations invest heavily in backup solutions but overlook system availability.
Backups protect data after an incident occurs, but they do not keep services running during hardware failures or unexpected outages.
High Availability focuses on maintaining service continuity during events such as:
NAS hardware failures
Storage controller failures
Network interface failures
Unexpected system crashes
Critical application failures
Reducing service interruptions improves business productivity and strengthens business continuity.
How Synology High Availability Works
Synology High Availability (SHA) combines two compatible Synology NAS devices into a single cluster.
The environment consists of:
An active server
A passive server
The active server runs production workloads while the passive server continuously synchronizes data, applications, and system configurations.
If the active server experiences a failure, the passive server automatically takes over operations with minimal interruption.
This automatic failover significantly reduces downtime.
Choosing the Right Hardware
Successful High Availability deployments begin with proper infrastructure planning.
Organizations should evaluate:
Compatible Synology NAS models
Required storage capacity
Memory configuration
Network bandwidth
Future scalability
Using similar hardware configurations on both systems helps ensure consistent performance during failover events.
Storage Reliability Architecture
Storage architecture directly affects both performance and availability.
Important Design Considerations Include:
RAID configuration
Storage pool design
SSD cache deployment
Capacity planning
Performance requirements
A well-designed storage environment provides both resilience and efficient resource utilization.
Building a Reliable Network
High Availability depends on stable network communication between both NAS systems.
Organizations should implement:
Dedicated heartbeat connections
Redundant network interfaces
High-speed Ethernet connectivity
Network segmentation where appropriate
Proper networking helps ensure accurate failover detection and uninterrupted synchronization.
How Synology High Availability Supports Business Continuity
Synology High Availability continuously synchronizes data and system information between two NAS systems.
Key Benefits Include:
Automatic failover
Continuous service availability
Centralized management
Reduced downtime
Simplified disaster recovery
These capabilities help businesses continue operating even during hardware failures.
Combining High Availability with Backup Protection
High Availability should complement, not replace, a comprehensive backup strategy.
Organizations should also implement:
Local backups
Offsite backups
Snapshot Replication
Disaster recovery planning
Recovery testing
A layered approach provides protection against hardware failures, accidental deletion, ransomware attacks, and site-wide disasters.
Supporting Virtualization Workloads
Many businesses use Synology NAS systems as shared storage for virtual infrastructure.
High Availability helps protect:
VMware environments
Microsoft Hyper-V
Virtual desktops
Business applications
Development environments
This reduces the risk of a storage failure affecting multiple virtual machines simultaneously.
Monitoring Cluster Health
Maintaining High Availability requires continuous monitoring.
Administrators should regularly review:
System health
Storage capacity
RAID status
Network connectivity
Replication status
Hardware alerts
Routine monitoring helps identify problems before they affect production systems.
Preparing for Future Growth
Storage requirements continue to increase as organizations grow.
High Availability planning should account for:
Additional users
Data growth
New business applications
Larger backup repositories
Future virtualization requirements
Scalable infrastructure enables organizations to expand without frequent redesigns.
High Availability Deployment Best Practices
Organizations can improve reliability by:
Selecting compatible NAS hardware
Choosing appropriate RAID configurations
Using dedicated heartbeat networks
Monitoring system health regularly
Testing failover procedures
Integrating backup and disaster recovery
Following these best practices helps build a resilient storage environment capable of supporting critical business operations.
About Epis Technology
Epis Technology helps organizations design, deploy, and manage Synology High Availability environments through infrastructure assessments, storage architecture planning, virtualization consulting, backup implementation, disaster recovery planning, and ongoing Synology support.
The company works with businesses to build reliable storage platforms that minimize downtime, improve resilience, and support sustainable growth. By combining extensive Synology expertise with practical infrastructure planning, Epis Technology helps organizations maximize uptime while protecting their most valuable business data.