Derecho will be down for scheduled maintenance on Tuesday, April 2nd - Wednesday, April 3rd.  This maintenance window  will be extended by an additional day to facilitate upgrading the Slingshot High Performance network.  We anticipate the maintenance activities consuming the majority of Tuesday, with system checkout beginning Tuesday evening and continuing into Wednesday morning.  The system will be returned to users as soon as practical Wednesday, pending positive checkout results.

During this time, all Derecho login and compute nodes will be unavailable. Scheduler reservations will be put in place to ensure that all user jobs have completed before the downtime begins. Any jobs that are queued when the downtime begins will be retained for execution when the systems return to service.  Progress will be communicated through the Notifier system as well as the #derecho-users channel in our NCAR HPC Users Group Slack workspace throughout the course of the outage.