Rockwell Automation FactoryTalk Historian SE 3.0 H2H Interface User Guide - Manual (Page 8)

Introduction
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Automation recommends using n-way buffering which is supported with PI API v1.6.x and
later. Please see the PI API installation manual for details.
The Historian Archive subsystem may temporarily queue data in memory prior to it being
committed to disk. This can lead to data gaps when using Historian to Historian for real-time
data collection with history recovery enabled. To avoid data gaps the recommended
configuration is to run in history recovery only mode without snapshot updates. Note that this
means current real-time data from the source Historian Server will not be available on the
target Historian Server.
The interface is a PI API based application. It does not currently support tag annotations,
which are only available through the PI SDK. This means it cannot be used to copy Batch
Database data between Historian Servers.
The interface is a single threaded process. This design increases performance dependencies
on the responsiveness of the source and receiving Historian Servers and dependencies on
network quality.
It is highly recommended that users use tools such as Rockwell Automation‟s Performance
Monitor interface and Historian Ping interface to monitor these interface dependencies. These
interfaces are distributed by default with the latest Historian Server setup kit. This
information will be invaluable for troubleshooting Historian to Historian interface issues if
they should arise. Using these tools to monitor system health is also part of Rockwell
Automation‟s Best Practices Recommendations for FactoryTalk Historian System Mangers.
Interface Requirements
PItoPI requires the following software versions:

Windows Intel-based operating system

PI API version 1.6.1.5 or greater, which is distributed with the PI SDK installation
kit.

TCP/IP connections are needed to both receiving and source Historian Servers. This
interface also operates using RAS to connect over dial-up or ISDN connections. Dial-
up connections of 9600 baud have been used successfully.

To configure Phase 2 failover using the ICU you must use ICU 1.4.6.0 or later.
Note: The value of [PIHOME] variable for the 32-bit interface will depend on whether the
interface is being installed on a 32-bit operating system (C:\Program
Files\Rockwell Software\FactoryTalk Historian\PIPC) or a 64-bit operating
system (C:\Program Files (x86)\PIPC).
The value of [PIHOME64] variable for a 64-bit interface will be C:\Program Files\Rockwell
Software\FactoryTalk Historian\PIPC on the 64-bit Operating system.
In this documentation [PIHOME] will be used to represent the value for either [PIHOME]
or [PIHOME64]. The value of [PIHOME] is the directory which is the common location for
Historian client applications.