The procedure described below must be repeated for all client-server relationships in the
system, as appropriate.
● If you have several redundant servers, first update only the clients interconnected with the
standby server that has already been updated or that has been defined as the preferred
server for these clients.
● Then update the clients that are interconnected with the master server or that have defined
it as their preferred server.
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Figure 7-1 The numbering shows the sequence for the update.
7.10.2 Overview of the required tasks
Introduction
You update the redundant OS in runtime in five phases. Each phase is broken down into
individual steps.
The section shows you an overview of the steps required in the five phases. You will find more
detailed instructions for each phase in the following sections.
Failure, switchover and reintegration of high availability components
7.10 Guide to updating a redundant OS in runtime
High Availability Process Control Systems (V9.0)
Function Manual, 05/2017, A5E39221836-AA 219
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