As part of the ongoing effort to upgrade data center capacity for future computing needs, maintenance is scheduled from Wednesday, April 22 at 6 AM through Thursday, April 23 at 5 PM. This will affect all RCAC systems and the Research Network.

During this window, all RCAC systems and research network services will be unavailable, including:

• All Computing Clusters including Bell, Negishi, Gautschi, Scholar, Rowdy, Gilbreth, Hammer, Anvil.
• All Data Storage Systems including Data Depot, Fortress, Anvil Ceph storage, scratch and home storage on clusters, Research Network and ScienceDMZ
• Gateway services including Hubzero, GenAI Studio, Anvil GPT
• www.rcac.purdue.edu
• Geddes
• Globus

How does this maintenance impact you?

• Any Slurm jobs requesting a walltime that would extend past the start of the maintenance will not start and will remain in the queue until after maintenance is complete.
• All active sessions and jobs running on affected systems will be preempted at the start of the outage any queued jobs will not begin until services are restored.
• Access to login nodes, storage systems, and web portals will be unavailable throughout the downtime.
• Automated data workflows that rely on affected systems (e.g., rsync, data pipelines, archive processes) will not function until systems are back online.
• Globus transfers may time out during the maintenance window.

To prepare for this maintenance, we suggest to:

• Download any needed data or scripts before 6:00 AM on April 22.
• Prepare instrumentation devices for the Data Depot to be unavailable and

We appreciate your understanding and cooperation as we complete these necessary upgrades to improve reliability and performance across RCAC infrastructure. For assistance, questions, or concerns contact rcac-help@purdue.edu.

Best regards, Rosen Center for Advanced Computing (RCAC) / Purdue IT

Due to the outage, some jobs on Gilbreth did not requeue automatically. Users should check the status of any jobs that were running early this morning and resubmit them if needed.

Impact To You: At this time, you may notice latency or brief disruptions when accessing certain on-campus or external resources, especially during peak usage periods.

We appreciate your patience while we work to fully resolve the underlying problem and restore normal network performance. We will provide an update by 5:00PM EST today or sooner.

System monitoring has identified an issue where heavy job activity was overloading the Data Depot filesystem used by the clusters and Globus.

You may see the following impacts:

• Globus transfers to and from Depot collections may fail, stall, or run much more slowly than usual.
• Globus logins may be slow or occasionally fail when accessing Depot endpoints.
• Jobs on RCAC clusters that read from or write to Depot may experience slow file access, delayed directory listings, or timeouts.

Our engineers are investigating the high load from a large number of concurrent jobs and are working to reduce the impact on Depot, Globus, and cluster workloads. Existing jobs will continue to run, but any that are heavily Depot‑I/O‑bound may run more slowly or see I/O errors until performance improves. We will provide another update by 5:00PM EST or sooner if the issue is resolved.

Research Computing staff members will monitor the status of all computing and data resources in an effort to ensure continuous availability.

Research Computing staff members will monitor the ticketing system throughout the holiday period and answer critical issues and problems. Non-critical user issues and questions will be addressed beginning January 5th, 2026. There will also be no coffee hour consultations during this break.

Scratch file purging (on community clusters with scratch space) will continue as normal during the break, so be sure to archive your files in scratch storage. This does not apply to Data Depot or home directories -- only scratch storage.

Have a wonderful break, everyone, and we look forward to great things in the new year!

The Rossmann cluster is scheduled for maintenance and will be unavailable on Tuesday, December 9th, 2025 at 8:00am EDT until 5:00pm EDT.

What is being upgraded?

During this maintenance, Rossmann will have its scheduler's configurations updated to allow for resources to be purchased and allocated on the basis of CPU and GPU hour.

How does this affect you?

• Slurm jobs that are still queued when this maintenance begins on Tuesday, Dec 9th, 2025 at 8:00am EDT will be deleted.
• Your Slurm account names will change. Accounts using CPU resources will be suffixed with "-cpu" and accounts using GPU resources will be suffixed with "-gpu".
• A reservation will be created that will prevent jobs from starting if their end time would take the job past the start of maintenance. Because pending jobs will be deleted, these jobs will never run.
• Your CPU jobs will now be billed by the CPU-hour as the GPU jobs on Rossmann are currently.
• The output of slist and the default output of squeue will be modified to be more useful under the new design.
• The preemptible QOS will now utilize the GraceTime feature of Slurm allowing preemptible users to more easily checkpoint their jobs.

If you have questions about this upgrade or need help from our support staff, please reach out to us at rcac-help@purdue.edu.

Thank you!

Update: 3:00PM, EDT: Systems returning but queues are still paused on all clusters except for Bell and Hammer. Some clusters are waiting for full cooling to come fully back online. Next update at 4:00PM, EDT, or when all systems are returned to service.

Update: 2:30PM, EDT: Systems are steadily coming back online. Queues are still paused. Next update at 3:00PM, EDT.

The Rosen Center is currently experiencing an outage on all clusters due to a widespread power outage event on the Purdue West Lafayette Campus.

Currently engineers are bringing all services back up. Scheduling on all clusters will be resumed once services have stabilized.

We expect services to back shortly. We will update on the situation at 2:30PM, EDT.

We know how important timely access is to your research and truly appreciate your patience as this gets sorted out. If you have an urgent need or specific concerns, please don’t hesitate to contact us at rcac-help@purdue.edu.

Thanks again for your understanding.

We are actively monitoring the situation and working to resolve the disruptions as quickly as possible. During this time, you may encounter intermittent connectivity problems or degraded performance.

We appreciate your patience and understanding. If you encounter problems that require immediate attention, please contact rcac-help@purdue.edu. For Anvil users, please submit a ticket through ACCESS Help Desk at https://support.access-ci.org/help-ticket.