Nexus/ClusterOSUpgrade

Overview

UMIACS Technical Staff has finished upgrading the operating system version on all Nexus cluster nodes from Red Hat Enterprise Linux (RHEL) 8 to 9 as of Thursday 08/06/2026.

RHEL9 is still in the Full Support phase of its life cycle and introduces a newer major Linux kernel version and newer glibc version, improving compatibility with many newer software applications.

Scheduling

Upgrades for all cluster nodes have finished as of Thursday 08/06/2026.

Interoperability

Software and Modules

Please transition your virtual environments, workflows, etc. to work with RHEL9 as soon as possible. You can use the submission nodes that you have access to for transitioning and light testing - as always, please do not run any computationally intensive processes on these nodes. They are intended to be hosts for configuring environments/workflows and submitting jobs only. If you need to do more involved testing, please schedule a job for this.

The module tree for RHEL9 is populated with a large number of the same modules that are available in the RHEL8 module tree, although specific modules may have different versions available in the RHEL9 tree as compared to the RHEL8 tree. If you have a dependency on a specific version of a module that is not available in the RHEL9 tree, please contact staff and we can get one created.