How do I submit a job on OS SL6?

A: All worker nodes have been running OS Centos7. In case you need to run your job on OS SL6 use singularity containers. You only have to add a requirement for suitable singularity image to a job_submission_file.

+SingularityImage = "/cvmfs/farm.particle.cz/singularity/fzu_wn-slc6"

More detailed information can be found in the papers Singularity containers & legacy code @ CentOS7, presented by Petr Vokac at a seminar for Golias Farm users in April 2019.