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Running a system with mixed version servers is only recommended during the upgrade procedure. It is not advisable to run in a mixed version server environment for any longer than necessary.
There are various limitations to a system running a mixed version server environment. Clients connected to an upgraded standby server cannot:
If a user attempts any of these operations whilst connected to the standby server, the following message will be displayed:
Error attempting to: <Operation>
You attempted a write operation from a client connected to a Standby server, and the Standby server is running a different version of software to the Main server.
Write operations to standby servers running a different version of software to the main server are not supported.