It appears the “postgres pbs_datastore” process is missing. The most common reason I’m aware of is permission problems within the PBS_HOME/datastore directory itself. There may be files or directories with incorrect ownership and/or permissions. Before you try anything I suggest, please backup your PBS_HOME directory. Shut down PBS Pro and then archive PBS_HOME so you can restore it later if necessary. A couple things to try…
With PBS stopped, run the following command as root:
chown -R postgres:root /var/spool/pbs/datastore
Then try starting PBS and see if things work as expected.
If that fails, stop PBS and remove the datastore directory completely. PBS will attempt to recreate it when restarted.
The worst case scenario would be to stop PBS and remove /var/spool/pbs completely. Then restart PBS and let the scripts recreate PBS_HOME in its entirety. If that doesn’t work, I suspect you have some filesystem issue that is preventing PBS from working properly.