System Changes History

Contents:

• ARC System Changes: 2026-01
  • Updates to GPU drivers
  • Minor Reorganization of /scratch directories
    • Summary of changes
    • Details and explanation
    • Tips for managing /scratch/user
  • New Software Installations
  • Increase Billing Rate for Usage of Memory
    • What should you do in response?
• ARC System Changes: 2025-08
  • Default umask changes from 022 to 007
    • Summary
    • Linux permissions overview
  • FAQ
  • Additional recommendations
• ARC System Changes: 2025-05
  • Partition Changes
    • Consolidation of partitions
    • Decoupling CPU and Memory Requests to enable “right-sizing” of jobs
  • Job Billing
    • Free Tier Increases to 2M units per PI monthly
    • Billing Consistently Applies to all Clusters
    • Billing Reflects All Resources Allocated
  • Adding QoS Options for Scheduling Flexibility
  • Cluster organization
    • Infer cluster being retired
    • Operating System Upgrade on All Clusters
    • /globalscratch symlinks for /scratch are removed
    • Cluster data to be made “private”
    • New tools for cluster monitorization
  • Software and Modules Unification
    • Mount point updates for software stacks
  • Frequently Asked Questions (FAQ)
    • Slurm jobs
    • Software
    • Billing
• ARC System Changes: 2025-01
  • Outline of Changes
    • Tinkercliffs Operating System Upgrade from CentOS 7 to Rocky 9
    • New Open OnDemand
    • /scratch and /common replacing /globalscratch and /global
    • /fastscratch and /vtarchive removed from clusters
  • Answers for some frequently asked questions (FAQ)
    • “The software module I used before maintenance isn’t there now. Can you reinstall it for me?”
    • “What does ‘Legacy Apps’ on Open OnDemand mean?”
    • “How can I recover data from /fastscratch?”