Scheduled maintenance will be performed on Grace beginning Monday, February 4, 2019, at 8:00 am. Maintenance is expected to be completed by the end of day, Wednesday, February 6, 2019. During this time, logins will be disabled and connections via Globus will not be available. We ask that you logoff the system prior to the start of the maintenance, after saving your work and closing any interactive applications. The Loomis GPFS storage will remain available and accessible on the Omega and Farnam clusters. An email notification will be sent when the maintenance has been completed, and the cluster is available.
As the maintenance window approaches, the Slurm scheduler will not start any job if the job’s requested wall clock time extends past the start of the maintenance period (8:00 am on February 4, 2019). If you run squeue, such jobs will show as pending jobs with the reason “ReqNodeNotAvail.” If your job can actually be completed in less time than you requested, you may be able to avoid this by making sure that you request the appropriate time limit using “-t” or “–time.” Held jobs will automatically return to active status after the maintenance period, at which time they will run in normal priority order.
Aside from the system and security updates we perform during maintenance, we want you to know about the following change:
Changes to Home Quotas: We will be changing the quotas on the Grace home directories from group limits to user limits during the maintenance. The new limits will be 100GB and 200,000 files per user. You can inspect your current usage by running “myquota” anywhere on the cluster. If you are currently using more than 100GB or 200,000 files, we recommend reducing your usage before the maintenance as you may not be able to run jobs until you are under the limits when the cluster returns.
Please visit the status page at research.computing.yale.edu for the latest updates. If you have questions, comments, or concerns, please contact us at hpc@yale.edu.
Sincerely,
Paul Gluhosky