Hello All,

We have a failover pair of OPC interface. UFO type is Hot. Both interface connected with primary DA member of collectives.

In below snippet, blue has Failover ID=1 and orange has failover ID=2. We can see that blue one went to Backup_No_PI state for a moment then came back to Backup state. but the same not happened with orange trend. Orange trend kept in Backup_No_PI state for long time.

Q1. Can interface failover successfully If interface remains in Backup_No_PI state?

Q2. What was the possible reason behind orange trend could not come out of Backup_No_PI state?

Please let us know if you need more information.

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0 Nik_Jinja over 1 year ago

(Missing Content) Gregor.Beck lal_babu.shaik. Do you have any idea on this?
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0 Community User over 1 year ago

If failover is configured correctly, if one member can not connect to PI, then a failover should occur. To understand what happened, you should look through the PI Message logs for clues. See this article for reference. Here is a post where someone did not want a failover to occur when the interface lost connection to the server, which shows upon going into "Backup_No_PI" failover did occur.
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0 Community User over 1 year ago

Hi Nik_Jinja,
I'd say that the message logs from both nodes should be examined.
Backup_No_PI means that it couldn't connect to the Data Archive. So this goes against your description. Please check if this node had any network issues around then.
The FailoverID=1 instance then should have taken over the primary role. It was unable from the look of the trend graph. Please check if both interface instance had access to modify the shared file.
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