PI Buffer Subsystem (version 2018 SP2 Patch1 or later)

PI Buffer Subsystem (PIBufss), which works with PI Server 3.4.375 or later, is one of two buffering services supported in PI ICU, the other being API Buffer Server (bufserv). See Buffering for information on those two services.

PIBufss is designed to enhance the high availability (HA) features of PI Server. PIBufss buffers data only to one non-replicated PI Server or one PI collective (with its various member nodes).

Note: In order to assure that PI buffering functions properly, the user specified in the "Log on as" portion of the Service tab must be a member of either the "PI Buffering Administrators" or the "PI Buffer Writers" user groups. A virtual service account can be added to those local groups, just like with any local/domain account. Failure to add a user to at least one of these user groups could result in a failure to buffer data. For more details please see the PI Buffer Subsystem user guide.

The version of PI Buffer Subsystem currently installed determines the process you follow to start buffering. It does not matter whether buffering is configured on this computer, or whether you use PI Buffer Subsystem or API Buffer Server.