Hyak consists of two independent clusters: ikt.hyak (hyak classic) and mox.hyak (hyak next-gen).
mox.Hyak is offline for scheduled maintenanceonline.*
*When a maintenance reservation is in place, jobs whose time limit (sbatch --time parameter) could allow the job to extend into the maintenance period will not be allowed to start by the scheduler. The squeue command will show the reason as 'ReqNodeNotAvail'.
Hyak will be offline from 9:00 am - 5:00 pm for scheduled maintenance the second Tuesday of every month. Every third month (Feb, May, Aug, Nov), the maintenance window will last from 9:00 am to 9:00 the following morning. More on the Maintenance schedule.