Redundancy - Both servers active
In a redundant system if the redundancy partners lose the connection to each other, both WinCC OA projects become active.
Do you know how long it takes before the standby switches to active?
When the network connection is lost between the two partners, both partners become active. It is quite normal that they do not go into passive mode.
To avoid this behavior, you can use redundant network connections between the servers.
I hope this will be useful to you.
I was wondering how long it takes for both partners to become active? Is it immediately as soon as the servers detect the broken link, or after X number of seconds (where X can be configured)?
-- Getting the information from theTCP stack (operating system)
-- Reaching the alive timeout for the connection (configured with aliveTimeout config entry, default 10 seconds)
For the connection between WinCC OA processes you must not use an aliveTimeout lower than 3 seconds.
Senior Support Specialist