Hello, I have a system with a redundant OS server, redundant Historical Server.

The problem is that when the OS server 1A is Master, the system does not download to the PH1B(active) but when the OS server 1B becomes Master, the download begins without problems.

Also when this Server 1B master is not downloaded to PH1A (active) only when PH1B is active.

I have reviewed and the Message Queuing in Server 1A are created only for Server 1B and for PH1A and in Server 1B they are created for Server 1A and only for PH1B, I don't know if this will be correct for redundant systems.

Perhaps some conflict has been created because in server states it only shows me the same historical server of principal and mirror at the same time.

I would appreciate any help.

Thank you.

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Split from forum publishing problem.

Hello Albelo,

at first welcome to the forum.

Please be so kind and don't post twice for the same problem.

You post also here (3rd answer):

Problem on Historical Data

Closed cause question posted twice.

The second thread with the subject redundant OS server is published within the conference Process Control Systems SIMATIC PCS 7.