Shared Data Source Options

Use the Shared Data Source Options tab to configure global settings for all data sources in a connector instance. Set discovery scan rates, history recovery parameters, and health update intervals to ensure consistent behavior across all data sources, regardless of the selected replication option. Configure these options first to establish reliable performance when targeting either a PI System or a Broker.

Apply changes in this tab to update all associated data sources. Restart data collection for the changes to take effect. Use this tab as the central location for managing shared data source behavior.

Review the following optional parameters to manage shared data source behavior. To verify your updated settings take effect, select Apply Changes.

History Recovery Start Time

Time (specified in PI time format) to recover historical data for all PI points. If the field is blank when saving the configuration, the default value of *-4h is used.

Note: Use the American English time format (for example, *-6h).

History recovery start time is applied to any PI Point added to the Connector when collecting Historical Data.

PI Point Discovery Scan Rate

Defines the frequency, in seconds, in which the connector checks with the source Data Archive for any PI Point changes.

If the field is blank when saving the configuration, the default value of 120 seconds is used.

Health Update Interval

This parameter determines the frequency at which the connector's health points are refreshed. The acceptable range for the Health Update interval is between 1 and 600. Setting the value to 0 deactivates Health updates.

The default for this parameter is 5 seconds.

Shared Data Source Options configuration

The following parameter determines if the PI points are signed up for real-time updates immediately on startup or if there are 8 hours or less between the current time and the PI points last update time. Real-time updates are held in the queue (in memory) on the connector for a PI point until history recovery is complete. The default for this parameter is true.

In general, AVEVA recommends not turning off this parameter. Situations where disabling this parameter might be necessary include the following:

• The connector is running on hardware that does not meet the minimum system requirements and/or preserving the machine's performance is essential.

• The connector's average data rates exceed 30,000 events per second.

• The number of PI points being handled by the connector has surpassed 100,000.

For further information on situations where disabling this flag might be advisable, see the Data Pipe Subscription knowledge article and contact AVEVA Technical Support.

Configure Cache

Select Configure Cache to set a location to temporarily store data that cannot be delivered to the destination broker.

The default size limit is -1MB, which allows the connector to automatically use available disk space as needed. When the limit is reached, data collection stops until additional space is available.

Set the size limit to 0 to disable caching or specify any integer value to define a fixed cache limit.

Note: If the AVEVA PI System Connector 3 (PSC3) is sending data directly to a destination PI Server as opposed to a broker, AVEVA recommends setting up the PI Buffer Subsystem. If PSC3 loses the connection to the destination PI Server while replicating data, the connector itself does not buffer the data, instead this task is handled by the PI Buffer Subsystem. Stopping the PI Buffer Subsystem service requires the PSC3 service to be stopped.