High Availability and Failover Configuration for SyteLine ERP
Production SyteLine environments demand high availability configurations that minimize downtime during hardware failures, software patches, and infrastructure maintenance. An HA architecture for SyteLine spans multiple layers: the web tier, the application tier, the IDO runtime, and the SQL Server database. Each layer requires its own failover strategy.
SQL Server Always On for SyteLine Databases
SQL Server Always On Availability Groups provide the foundation for SyteLine database high availability. The SyteLine application database, along with any custom reporting databases, should be configured in a synchronous-commit availability group with automatic failover. Read-only secondaries can offload SyteLine reporting workloads.
- Synchronous commit mode between primary and secondary replicas for zero data loss
- Automatic failover with a witness server or distributed availability group quorum
- Read-only routing for SyteLine Crystal Reports and SSRS report execution
- SyteLine connection strings must reference the Availability Group listener, not individual server names
- Database mail and SQL Agent jobs require manual failover handling outside the AG
Application Tier Redundancy
The SyteLine Application Server and IDO Runtime can be deployed on multiple servers behind a load balancer. Session affinity is required because the IDO maintains stateful sessions. Windows Network Load Balancing or hardware load balancers distribute SyteLine Web UI requests across IIS instances.
- Multiple IIS instances hosting SyteLine Web UI with sticky session load balancing
- IDO Application Server running on two or more nodes with session state managed externally
- Mongoose utility services configured for active-passive failover with Windows Clustering
- Health check endpoints monitoring SyteLine application pool status and IDO connectivity
- Automated IIS application pool recycling schedules aligned with low-activity maintenance windows
Monitoring and Automated Recovery
High availability without active monitoring is an illusion. SyteLine-specific health checks must verify not just server uptime but actual application responsiveness: IDO query execution, form load times, and background job completion. Automated remediation scripts should restart failed services before users notice degradation.
- Custom health probes testing IDO LoadCollection calls against the SyteLine database
- Windows Event Log monitoring for SyteLine Application Server errors and warnings
- SQL Server ring buffer and wait stats monitoring for early detection of database bottlenecks
- Automated PowerShell runbooks to restart IIS application pools and SyteLine services
- Alerting thresholds: page load >5s, IDO query >3s, SQL wait time >500ms
Ensure your SyteLine environment never goes down unexpectedly -- let our HA specialists design your failover architecture.
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