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Status Future consideration
Workspace Informix
Components Informix Server
Created by Guest
Created on Jan 2, 2020

Full HDR switch between primary and secondary with a single command and without any downtime

  • We have  2  servers with 2 HDR instances each.
  • For each cluster we have also 2 connection manager each.
  • On server one there is the primary of cluster 1 and the secondary of cluster 2
  • On server two there is the primary of cluster 2 and the secondary of cluster 1
  • For maintenance reasons it would be nice to have a single command to promote the an HDR secondary as primary and the former primary automatically as an HDR secondary.
  • With onmode -d make primary on the secondary it takes quite a long time until the secondary will be promoted as primary. The reason is that the secondary could only be promoted as primary when all oninit processes of the former primary will be stopped.
  • In our landscape, even with minimum time settings, it takes over 3 minutes plus the time to set up the former primary as secondary. Even this set (hdrmksec.sh) takes between 5-10 minutes because of the amount of shared memory we have on this instance.
  • In a production environment with 24/7 requirements the needed time even 3++ minutes are not exceptional.