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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.
  • Avatar32.5fb70cce7410889e661286fd7f1897de Guest
  • Jan 2 2020
  • Needs review
Why is it useful?
Who would benefit from this IDEA? Every customer who runs HDR/RSS/SDS
How should it work?
  1. One single onmode command like 'onmode -d switch'
  2. primary to secondary and secondary to primary switch with ### NO ### or nearly no downtime
  3. Currently we are stopping the primary in a regular way with 'onmode -ucky' including a fail-over to HDR secondary and a final hdmksec.sh on the former primary.
    'onmode -d make primary' does not work in all cases because form time to time a message 'DRAUTO=3 and CMSM detected an active primary in the MACH11 cluster' came up. => I opened a case for that
Idea Priority High
Priority Justification Our customer requested such kind of feature because we have this problem on production
Customer Name PostNord
Submitting Organization
Submitter Tags
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