The Delta resource will undergo maintenance from 8:00AM to 8:00PM CDT on Wednesday April 19th, 2023. Additional notices will be sent if changes to the plan occur. 

During the maintenance period the following changes will be made:

• Operating system (OS) on the Delta login and compute nodes will be updated from RHEL 8.4 to 8.6 with no expected impact to the existing software stack.
• Software for the Delta high-speed network (HSN) switches and fabric manager will be upgraded.
• Lustre file system client software will be updated to address known issues.
• NVIDIA GPU driver will be upgraded to CUDA 12, while the default CUDA software module will remain at CUDA 11.6.1 until the next planned maintenance.
• The hostname command will provide the public-facing hostname and IP address rather than the internal hostname and IP address.
  • Workflows that use the hostname --ip  command need to check that  references to 172.x  are changed to the matching 141.x addresses.

All Delta resources will be unavailable during the maintenance period including:

• Delta login nodes - unavailable
• Delta compute nodes - unavailable
• Delta services
  • Open OnDemand - unavailable 
  • Delta Globus Online endpoint - unavailable

All running jobs will have been drained in advance of the maintenance. Queued jobs will persist and be eligible to run once maintenance is complete. 

A follow-up message will be sent once maintenance is complete.

Please send questions to help@ncsa.illinois.edu and be sure to mention Delta in the subject.