The Delta resource will undergo maintenance starting 8:00AM on Tuesday January 23rd, 2024. During the maintenance Delta compute nodes will be upgraded with the HPC Cassini network interface card and will boot with an OS image updated to support the new Slingshot11 communication software stack.  Please see the Delta Network Upgrade page at https://wiki.ncsa.illinois.edu/display/DSC/Delta+Network+Upgrade for information on the forthcoming changes.

During the maintenance period:

• Jobs will continue to be scheduled to run.
• Compute nodes will be upgraded in batches on Tuesday and Wednesday.
• the dt-login.delta.ncsa.illinois.edu and login.delta.ncsa.illinois.edu alias will point to the upgraded dt-login03 and dt-login04 login nodes.
• dt-login01 will be rebooted but will remain available as a Slingshot10 configured login node.


Delta resources will be available during the maintenance period:

Delta login nodes
• On Tuesday users are encouraged to use the dt-login.delta.ncsa.illinois.edu ssh alias or dt-login03.delta.ncsa.illinois.edu and dt-login04.delta.ncsa.illinois.edu in particular to begin to use compute nodes moved to the Slingshot11 configuration.
• Jobs submitted from dt-login03 and dt-login04 will automatically be assigned to run on upgraded compute nodes.
• dt-login01 will remain available in the Slingshot10 configuration to be used to address any porting issues discovered during the upgrade.
• Jobs submitted from dt-login01 will automatically be assigned to run on non-upgraded compute nodes.

Delta compute nodes
• On Tuesday and Wednesday 1/2 of each node type will be upgraded and moved to the Slingshot11 configuration.
• The pool of available upgraded nodes will increase during the day as they are returned to service.
• Two compute nodes of each type, except for the gpuA100x8 nodes and the gpuMI100x8 node, will remain on Slingshot10 to address any porting issues discovered during the upgrade.

Delta services:
• Open OnDemand - will move to supporting Slingshot11 on Tuesday morning after a security software update. Expect a 30 - 60 minute OnDemand outage between 8:00AM and 9:00AM.
• Delta Globus Online endpoint - available.

Reminder:
• Codes that use OpenMPI or similar on the Slingshot10 nodes will need to be rebuilt to run on the upgraded Slingshot11 nodes.
• Jobs submitted from dt-login01  will only run on the remaining non-upgraded Slingshot10 computes nodes.

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.