Infor SyteLine3 min readNetray Engineering TeamPublished February 14, 2026

High Availability and Failover Configuration for SyteLine ERP

Short answer

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

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SyteLine Utility and Web Server Sizing Calculator

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Turn named users, concurrency and your own per-session assumptions into a server count and RAM plan for the SyteLine 10 application tier.

Your numbers

Named users

users

Peak concurrency

60 %

Share of named users with an active session at the busiest time.

API and integration sessions

sessions

IDO REST clients, ION, Factory Track, scheduled integrations.

Sessions per app server

sessions

Planning assumption. Replace with your partner's figure, Infor's sizing guide for your release, or a load test.

RAM per active session

Planning assumption. Measure IDO Runtime and web process memory under load.

Base RAM per server

Operating system, IIS and idle services.

TaskMan and service reserve

TaskMan, event, replication and other services on the server.

CPU cores per server

cores

Your results

Application servers

Before adding one for redundancy.

RAM per server

14.9297

Gigabytes per application server.

Concurrent sessions

100

RAM per server, rounded to 8 GB

Total application tier RAM

Sessions per core

6.25

Compare with what your load test showed as comfortable.

Every ratio here is a planning assumption, not an Infor sizing figure. Replace the defaults with values from the Infor hardware sizing guidance for your SyteLine release or from a load test before buying hardware.

Free, optional. Reopen it on any device.

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Servers and RAM per server vs named users

Sweeps Named users from 25 to 1000, holding your other inputs fixed.

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Share users, sites, integrations and your current server metrics and we will return a reviewed application tier sizing with the assumptions spelled out.

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

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