Preface

The old operating system CentOS 7 has reached its end of life. For this reason the operating system (OS) of Lise’s CPU partition "Lise" will be updated to the new Rocky Linux 9. This affects all login and compute nodes equipped with Intel Xeon Cascade Lake processors ("clx" for short). Lise's GPU partitions (GPU -A100 partition and GPU-PVC partition) are not affected.

It is important for users to follow the Action Items action items specified below. Rocky Linux 9 introduces new versions of various system tools and libraries. Some codes compiled earlier under CentOS 7 might not be working under Rocky Linux 9 anymore. Thus, legacy versions of environment modules offered under CentOS 7 were not transferred to the new OS environment or have been replaced by more recent versions.

The migration to the new OS migration is organised in three consecutive phases. The migration It is expected to be complete by the end of July.

1. The testing first phase starts with 2 login nodes and 112 compute nodes already running migrated to Rocky Linux 9 for testing, while the . The other nodes remain available under CentOS 7 for continued production.

2. After testing the test phase, a major fraction of nodes will be switched to Rocky Linux 9 to allow for general job production under the new OS.

3. In During the last phase, the only a few remaining nodes still remain under CentOS 7. At the very end, they will be converted migrated 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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