# Primary server take over after failover **URL:** \ **Category:** Users/Site Administrators\ **Created:** [November 7, 2023, 4:00pm UTC](https://community.openpbs.org/t/primary-server-take-over-after-failover/3701 "2023-11-07T16:00:08Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![tuthmose](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.openpbs.org/tuthmose/32/635_2.png) [@tuthmose](https://community.openpbs.org/u/tuthmose)\ **Post date:** [November 7, 2023, 4:00pm UTC](https://community.openpbs.org/t/primary-server-take-over-after-failover/3701/1 "2023-11-07T16:00:08Z")
Hi all, I am testing a PBS configuration with failover; PBS version is 22.05.11 on Rocky Linux 8.8. Here’s the situation: 1. The primary server is active and the secondary “watches”. 2. I stop the primary (either just stop the PBS service or shutdown the node) 3. The secondary becomes active; failover is smooth and fast. 4. I make a few submission test then _I restart the primary_ 5. The failover is once again fast but when the scheduler comes up it says `pbs_sched;Svr;pbs_sched;Invalid request (15004) in open_server_conns, Couldn't register the scheduler default with connected server` There is a short time interval during the takeover process by the primary in which _I can observe the scheduler PID on both servers_ than the one running on the secondary is stopped. This apparently sends the scheduler on the primary in a sort of loop (the above error is repeated over and over) until I kill and start the scheduler process manually. I also get this other error `Svr;pbs_sched;Scheduler already connected (15230) in open_server_conns, Couldn't register the scheduler default with connected server`. This may be a problem in a situation in which (i) there is a failover and then (ii) the primary gets back automatically. Or I am missing something and this is an expected behaviour? For experimentation I have now modified the `pre_start_pbs` function in `pbs_init.d` in the following way (just the same of the manual kill): ```shell 633 start_pbs 634 echo "a comment" 635 stop_pbs 636 start_pbs ``` in conclusion I have three questions: 1. Primary scheduler in loop is expected? 2. Can depend on some sync problem on the DB 3. Assuming I cannot solve the problem, there’s a more sensible workaround? thank you in advance for your help