Issue
Why do the Architectural Guidelines specify a maximum of 1500 Extended Trend Logs in Automation Servers, whereas such a limitation did not exist with the Continuum Net Controllers, like the NetController II.
Product Line
EcoStruxure Building Operation
Environment
- Building Operation Automation Server Premium
- Building Operation Automation Server Bundled
Cause
EcoStruxure Building Operation's architectural guidelines specify a limit of 1500 Extended Trend Logs for the Automation Servers (AS-P/AS-B). Sites transitioning from Andover Continuum to EcoStruxure Building Operation need to understand the architectural differences that necessitate this limit.
Resolution
The architectural differences between Continuum and EcoStruxure Building Operation means that it is crucial that Extended Trend Logs are managed effectively to ensure ensuring optimal system performance.
In Continuum:
- Controller Role: Controllers do not participate in Extended Trend Log functionality beyond sending data from intrinsic logs upon request from Cyberstations.
- Log Management: Extended Trend Logs reside at and are managed by Cyberstations.
- Load Distribution: Multiple Cyberstations, configured to collaborate, maintain the Extended Trend Logs, minimizing the load on controllers.
This design puts very little load on the controllers when it comes to Extended Trend Log functionality.
In EcoStruxure Building Operation:
- Distributed Database Architecture: Extended Trend Logs are managed by the AS-P/AS-B servers.
- Server Load: The server performs tasks typically handled by multiple Cyberstations in Continuum, which often run on more powerful PC hardware.
- Performance Management: To prevent Extended Trend Log servicing from overwhelming the Automation Server's resources (CPU, memory), a limit of 1500 logs is enforced. Exceeding this limit can degrade server performance and potentially cause reboots due to critical memory usage. This can be seen in the following example trace log entry: Nov 30 15:39:58 PSS-AS02 memcritsv[1011]: Memory usage critical!
