IBM Data Platform Ideas Portal for Customers


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Status Submitted
Workspace Informix
Components Informix Server
Created by Guest
Created on Jul 16, 2025

RELATED IDEAS

Compatibility of SDS_ALTERNATE and logged SBSPACE

Our Standard Informix Cluster consists of Primary, SDS and RSS Server.

While testing Failover with broken Network, we recognized that it is possible to get two Primarys when DRAUTO = 3 is set and the Network Connection of the Primary is interrupted. 

To prevent this it is possible to set an seperate BLOBDBSPACE and configure it via SDS_ALTERNATE in the onconfig. When setting this there is no Split Brain when the Connections are interruppted.

BUT... Because of we are also using a RSS Server (which is also Backupd via external Backup) it is only possible to use a BLOBDBSPACE. A Backup is than only possible, when set  ARCHIVE_UNLOGGED_OBJECTS  on the RSS to 1 or 2. But when setting this we will not get an 100% consistent Backup.

It feels something like a cat which is trying to bite its own tail :)

It would be helpfull if SDS_ALTERNATE also could be a logged SBSPACE, so it is possible to secure SDS / PRIMARY Communication outside the Networklayer, and also get a 100% consistent Backup on the RSS.

Needed By Quarter

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