Understand data buffering

Connectors and relays can buffer data whenever data crosses from one process boundary to another. Buffering is always on and cannot be turned off. There are no separate processes associated with buffering. Each connector or relay process itself buffers the data.

During setup, you can specify the folder where data is buffered and other state information is stored. The default folder is a subfolder of %ProgramData%\OSIsoft\Tau.

Connectors and relays gather and group data when it is buffered: when data is sent from connector to relay, and when data is sent from relay to PI AF or Data Archive. Each relay, PI AF, and Data Archive server gets its own buffer queue in the connector or relay; that is, if a connector is configured to send data to two different relays, and then the connector buffers the data individually for each relay.

Note: Relays cannot send information to other relays.