[Jlab-scicomp-briefs] JLab farm changes follow-up

[Bryan Hess]

Below is a summary of yesterday's Maintenance Day changes that may affect you:



  *   The DNS alias ifarm.jlab.org now points to two new AlmaLinux (EL9) nodes with a substantial upgrade in memory and CPU. We recommend ssh-ing to ifarm.jlab.org rather than individual hostnames.


  *
A single CentOS 7 (EL7) node, ifarm1901, will remain online for legacy code transitions until the August 20th Maintenance day at which point it will be shutdown.


  *
ssh keys have changed for ifarm.jlab.org. In this case, it is acceptable to remove the old key using "ssh-keygen -R hostname"

To complete the AlmaLinux migration in SLURM, the el7​ feature has been removed. This may require modification to your SLURM job submissions. Here is how to plan now for the change:

  1.
Review SLURM Job Submission Scripts:
     *
Identify where the el7 constraint is being specified in your SLURM job submission scripts. This is typically done using the -C or --constraint flag followed by the constraint specification. For example: --constraints=el7|el9​
     *
Remove the el7 constraint from your job submission commands. If you have other constraints, adjust accordingly.

Failure to remove the el7​ constraint after maintenance day will result in failed job submissions. The resulting error will be similar to:

  Unable to allocate resources: Invalid feature specification




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