Installing updates and service packs
3.1 Introduction
Compendium Part D - Operation and Maintenance (V9.0)
Operating Manual, 02/2018, A5E43228948-AA
11
In this context, maintenance is considered a task performed when the OS server is
deactivated and in which the OS software version is not changed. This may involve cleaning
the OS server hardware, for example.
When a redundant OS server is deactivated, you should avoid the situation where all OS
clients switching from the master server to the standby server at a given time, because this
would render the plant inoperable for the duration of the switchover.
Configuring a preferred server for the OS clients enables you to achieve even distribution
across the master and standby servers. If one of the OS servers is deactivated, only half of
the OS clients will switch to the partner server.
You must install the same software version on the OS servers and the OS clients connected
to them.
The standby OS server is usually deactivated first and its software updated. Before you
deactivate the standby OS server you must check that the master OS server is fully
functional and a sufficient number of functional OS clients must be connected to that master
OS server.
First update only the OS clients which are interconnected with the standby OS server that
has already been updated or which have defined it as their preferred server. Then update
the OS clients which are interconnected with the master OS server or which have defined it
as their preferred server.
This method is not practical if the maximum number of OS clients must be available for
operator control and monitoring purposes during the software update. In this case, all OS
clients must first be connected to the master server by configuring the preferred server. The
standby server is then deactivated, the OS software updated, and the server started again.
The next step involves deactivating each OS client one after the other, updating the
software, and then connecting each OS client to the standby server by configuring the
preferred server. Once each OS client has been updated, check that its operator control and
monitoring functions are working correctly.
To Next Page
Loading...
Need help?
General
