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The OS migration phase starts with a small number of two login nodes and one rack of 96 compute nodes already running Rocky Linux 9 for testing, while the other nodes remain available under CentOS 7. After an initial testing period, a major fraction of nodes will be switched to the new OS Rocky Linux 9 to allow for general job production under Rocky Linux 9the new OS. In the last step, the few nodes still under CentOS 7 will be converted to Rocky Linux 9, too. During the migration phase the use of Rocky Linux 9 "clx" compute nodes will be free of charge.

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SLURM

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partitions

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• For users of SLURM’s srun job launcher:
  Open MPI 5.x has dropped support for the PMI-2 APAPI, it solely depends on PMIx to bootstrap MPI processes. For this reason the environment setting was changed from SLURM_MPI_TYPE=pmi2 to SLURM_MPI_TYPE=pmix, so binaries linked against Open MPI can be started as usual “out of the box” using srun mybinary. For the case of a binary linked against Intel-MPI, this works too when a recent version (≥2021.11) of Intel-MPI has been used. If an older version of Intel-MPI has been used, and relinking/recompiling is not possible, one can follow the workaround for PMI-2 with srun as described in the Q&A section below. Switching from srun to mpirun instead should also be considered.

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• log in to an already migrated login node and get familiar with the new environment

• check self-compiled software for continued operability

• relink/recompile software as needed

• adapt and test job scripts and workflows

• submit test jobs to the "cpu-clx:test" SLURM partition

• read the Q&A section and ask for support in case of further questions, problems, or software requests (support@nhr.zib.de)

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