2026 ARC Summer Maintenance

This page provides key details about the maintenance schedule and purpose. We will add content with specifics about the maintenance as we complete our planning and building.

Maintenance Dates

  • Great Lakes: June 15
  • Armis2/Lighthouse: June 15-18

HPC (High-Performance Computing) - All Clusters


 

Summer 2026

(version changes in bold)

Winter 2026

Red Hat 8.10

  • Kernel  4.18.0-553.123.1.el8_10.x86_64

  • glibc-2.28-251.el8_10.34.x86_64

  • ucx-1.18.0-1.2410068.x86_64 (OFED 24.10 provided)

  • gcc-8.5.0-28.el8_10.x86_64

Red Hat 8.10

  • Kernel  4.18.0-553.85.1.el8_10.x86_64

  • glibc-2.28-251.el8_10.25.x86_64

  • ucx-1.16.0-1.2310409.x86_64 (OFED LTS provided)

  • gcc-8.5.0-28.el8_10.x86_64

Mlnx-ofa_kernel-modules 

  • OFED-24.10-4.1.4.0

Mlnx-ofa_kernel-modules 

  • OFED-23.10-5.1.4

Slurm 25.11.5 compiled with:

  • PMIx

    • /opt/pmix/4.2.9

    • /opt/pmix/5.0.10

  • hwloc 2.2.0-3 (OS provided)

  • ucx-1.18.0-1.2410068.x86_64 (OFED LTS provided)

  • slurm-libpmi

  • slurm-contribs

Slurm 25.11.1 compiled with:

  • PMIx

  • /opt/pmix/4.2.9

  • /opt/pmix/5.0.9

  • hwloc 2.2.0-3 (OS provided)

  • ucx-1.16.0-1.2310409.x86_64 (OFED LTS provided)

  • slurm-libpmi

  • slurm-contribs

PMIx LD config /opt/pmix/4.2.9/lib

PMIx LD config /opt/pmix/4.2.9/lib

PMIx versions available in /opt :

  • 4.2.9

  • 5.0.10

PMIx versions available in /opt :

  • 4.2.9

  • 5.0.9

Singularity CE (Sylabs.io)

  • 4.3.7

  • 4.4.1

Singularity CE (Sylabs.io)

  • 4.1.5

  • 4.3.4

NVIDIA driver branch picked per card (580 / 590 / 595 available in repo)

  •  Pre-GSP cards (V100, P40, TITAN V) forced to 580 legacy line via supported-gpus.json
  • Turing+ silicon: branch selected by nvidia-driver-assistant
  • CUDA 13 support

NVIDIA driver 570.124.06

  • CUDA 13 support

Open OnDemand 4.1.5

 

Open OnDemand 4.0.8

Okta MFA for SSH

The university has recently transitioned to Okta for web-based login requests, and ARC currently plans to make a similar change for SSH access to ARC HPC clusters during our June summer maintenance. After the maintenance is complete, users should expect to use Okta as the MFA option for both Open OnDemand and SSH access to ARC HPC clusters.

HPC (High-Performance Computing) - Great Lakes System

Great Lakes will be patched with an updated version of Slurm and Open OnDemand.

HPC (High-Performance Computing) - Armis2 and Lighthouse

  • The Data Center Engineering team will be working with contractors to perform the annual preventative maintenance on the data center where Armis2 and Lighthouse are racked.
  • Armis2 and Lighthouse will be patched with an updated version of Slurm and Open OnDemand.

Preventative Maintenance Work

  • MDC (Main Data Center) Maintenance
  • UPS (Uninterruptible Power Supply) maintenance

HPC Software Updates

During the Summer 2026 maintenance window, ARC will update software defaults to the latest installed versions where appropriate. Several new software versions and updated application stacks will also be made available.

  • Spark: Spark/4.1.1 with updated Java/JNI compatibility.
  • Stata-MP: StataNow 19.5 with updated 2-core and 2+ core job logic.
  • FlexiBLAS stack: new FlexiBLAS-enabled scientific software stack.
  • R: R/4.6.0 linked to FlexiBLAS and built for the GCC 15 software stack.
  • CUDA: CUDA/13.2.
  • cuDNN: cuDNN/9.22.
  • OpenJDK: OpenJDK/26.
  • SingularityCE: 4.3.7 and 4.4.1.
  • Open MPI: OpenMPI/5.0.10 built with PMIx/5.0.10.

Reminder: Users who require a specific software version for reproducibility should load that version explicitly in their job scripts instead of relying on the default module.

After maintenance, users are encouraged to test representative jobs before resuming large production runs.

Storage

Turbo System Networking Upgrade

  • Networking Update: Upgrading networking infrastructure for Turbo to improve connectivity and resilience.
  • Operating System Update: Upgrading OS for security patches and performance improvements. No user outages expected. 

Locker Networking Migration

Networking Update: Locker will need to be shut down for network maintenance in ASB.

Globus

Version: To Be Determined (TBD)

SES (Service Environment Systems)

  • Firmware Updates: Applying the latest firmware versions to ensure stability and security.
  • Networking Configuration and Hardware Update: Updating networking configuration and hardware. No end-user impacts expected.
  • Okta Transition: All SES instances will be transitioned from Duo to Okta during this window. 

Contact Information

For questions or additional support, please contact ARC Support.