Online Upgrade

An online upgrade takes advantage of Plant SCADA's native server redundancy to avoid loss of data and minimize downtime on a production system.

To confirm if your system will support an online upgrade, see Pre-requisites for Online Upgrade.

Note: An online upgrade is only supported from versions that are currently in mainstream support.

There are two ways to perform an online upgrade:

• Upgrade one by one — firstly primary servers, then clients and then standby servers.

• Upgrade side by side — where a new set of server and clients runs in parallel. Be aware that this approach may impact system performance as duplicate I/Os will double the number of PLC data requests.

Note: If a primary server is running an earlier version of Plant SCADA than a standby server, then the server communication will be lost.

You need to avoid the following scenarios during an online upgrade.

• Do not shut down the upgraded primary server before the standby is upgraded.

• Do not stop both the servers when the upgrade is in progress.

• Do not start the non-upgraded standby server when the upgraded primary server is running.

Similar to an Offline Upgrade, you will also need to follow the necessary Upgrade Path and repeat the installation process as many times as required to migrate from your existing version to a more recent version.

The required patches for an online upgrade are:

• For Plant SCADA 2020 R2, Update 2 (March 2022) or later is required.

• For Plant SCADA 2023, you can upgrade from an RTM installation or a later installed update.

Refer to the following sections for specific instructions on how to upgrade from your current version.

• Online Upgrade from Plant SCADA 2020 R2

• Online Upgrade from Plant SCADA 2023.

See Also

Troubleshooting an Online Upgrade