# High Availability and Failover Configuration for SyteLine ERP

> Source: https://netray.co/resources/syteline-high-availability-setup-guide
> Publisher: Netray (netray.co), AI and integration engineering for ERP and manufacturing systems.
> Section: Knowledge Base

## Short answer

Configure high availability for SyteLine ERP with SQL Server Always On, IIS failover, load balancing, and automated recovery for CloudSuite Industrial.

## Category

syteline

## Content

**Intro:** 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.

**Sections:**

#### SQL Server Always On for SyteLine Databases

**Body:** 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.

**Bullets:**

- 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

**Body:** 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.

**Bullets:**

- 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

**Body:** 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.

**Bullets:**

- 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

**Cta:** Ensure your SyteLine environment never goes down unexpectedly -- let our HA specialists design your failover architecture.

## Related Slugs

- syteline-disaster-recovery-planning-erp
- syteline-sql-server-configuration-erp
- syteline-cloud-deployment-architecture

## Search terms

SyteLine high availability, SyteLine failover configuration, CloudSuite Industrial HA setup, SyteLine Always On Availability Groups, SyteLine load balancing

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