Home
Availability
How to get your system uptime to the maximum.
NGA - High Availability Configuration (HAC)
This chapter provides an overview of the High Availability Configuration for redundant or non-redundant WinCC OA projects (High Availability Configuration - HAC) and explains the roles of the components etcd and Patroni, which are required to set up HAC.
Installation and Configuration - Linux
This chapter provides an overview of the installation and configuration steps for the High Availability Configuration (HAC).

Version Information
Release Notes, Update information, Certifications and Frequently Asked Questions.
Concepts
Your first step into modern and powerful process visualization.
Deployment
Topics you need to know before using WinCC OA.
Security
Go beyond the norm in cybersecurity.
Engineering
Powerful tools for easy or complex engineering tasks.
Data Management
Classify, structure and archive your data.
Business Logic / Control
Endless possibilities in data processing for your projects.
Data Visualization
User interfaces, Trends and Reports for every purpose and device.
Southbound Interfaces
The process connection to the actual machines/sensors.
Northbound Interfaces
Your portal to the cloud or supervising systems.
Web Connectivity / Network Interfaces
Data exchange, APIs and web technologies
User Management
All about authorization, authentication and login-customization.
Availability
How to get your system uptime to the maximum.
- Disaster Recovery System
- Redundancy
  The high availability requirements of plant constructors and operators as well as the process and data security can be covered with the redundancy concept of WinCC OA.
- Redundant network connections
  In order to achieve a better fault tolerance WinCC OA Managers can connect to other WinCC OA Managers running on different computers via redundant network connections (this means connecting through two network connections (= IP connection)).
- Alive mechanism of manager connections
  The alive mechanism in WinCC OA serves for connection controlling between the single managers. Each manager sends alive messages at definable intervals.
- Error tolerance and stability
  Continuous improvements are made concerning the error tolerance and reliability. This page gives an overview and description of the changes. Additional information can be found in the further chapters of the documentation.
- Kubernetes Health Check
  An introduction to health checks with Kubernetes for WinCC OA.
- Message Compression
  The message compression compresses WinCC OA messages. Data compression means encoding information using fewer bits than an unencoded representation would use through use of specific encoding schemes.
- Identification Caching
  The identification caching provides you an advantage especially when using remote user interfaces and distributed systems. Identification caching allows the identification to be sent as “delta” instead of the whole identification. Thus, only the changes are sent by the Data and the Dist managers.
- System Dashboard
  The System Dashboard in WinCC OA provides a central overview of system status, performance metrics, and security aspects. It helps operators and administrators quickly view and assess important information.
- NGA - High Availability Configuration (HAC)
  This chapter provides an overview of the High Availability Configuration for redundant or non-redundant WinCC OA projects (High Availability Configuration - HAC) and explains the roles of the components etcd and Patroni, which are required to set up HAC.
  - Requirements
    This chapter contains the requirements for NGA - High Availability Configuration (HAC).
  - Installation and Configuration - Windows
    This chapter provides an overview of the installation and configuration steps for the High Availability Configuration (HAC).
  - Installation and Configuration - Linux
    This chapter provides an overview of the installation and configuration steps for the High Availability Configuration (HAC).
    - Step 1 – Installation of necessary Software
      In this step, you install all necessary software for High Availability Configuration on Linux servers.
    - Step 2 – Configuration of the etcd
      In this step, you configure and start the etcd service on Database Server 1, Database Server 2, and the Dedicated etcd Server.
    - Step 3 – Configuration of the Patroni Cluster
      Set up the cluster with the provided configuration file template and the binaries from the WinCC OA installation. Adapt the configuration to your project needs. For example, calculate and configure the disk space for WAL retention to enable fast recovery after a node failure.
    - Step 4 – WinCC OA Configuration
      Create the WinCC OA schema in the database on the leader node. Then, create a WinCC OA project using NGA and set up the database connections.
  - Failover and Recovery Scenarios
    This chapter explains the failover and recovery scenarios for the High Availability Configuration (HAC).
  - Update Scenarios
    This chapter describes the update scenarios for the High Availability Configuration (HAC).
  - Restrictions
    This chapter contains the restrictions for NGA - High Availability Configuration (HAC).
Reporting
Create state of the art project reports without limits.
Addons
Useful tools and enhancements for special demands.
Reference Tables
Detailed and extensive content for special project adaptation.
Videos & Tutorials
Explore the capabilities of WinCC OA with our carefully selected collection of video tutorials and guides.
eLearning
Build Your Expertise Step by Step
Documentation
Basic information about terms and functions within the documentation.
Support & Services
An experienced team of support agents, consultants and trainers are ready to facilitate active partnerships with our customers, so they can profit from our comprehensive service.
Disclaimer
A brief clarification of liability exclusions or legal notices.

Installation and Configuration - Linux

This chapter provides an overview of the installation and configuration steps for the High Availability Configuration (HAC).