- Current System Load - CPU, GPU
- Service Alerts
- Maintenance Sessions
- Previous Service Alerts
- System Status Mailings
- FAQ
- Usage statistics
Current System Load - CPU
The plot below shows the status of nodes on the current ARCHER2 Full System service. A description of each of the status types is provided below the plot.
- alloc: Nodes running user jobs
- idle: Nodes available for user jobs
- resv: Nodes in reservation and not available for standard user jobs
- plnd: Nodes are planned to be used for a future jobs. If pending jobs can fit in the space before the future job is due to start they can run on these nodes (often referred to as backfilling).
- down, drain, maint, drng, comp, boot: Nodes unavailable for user jobs
- mix: Nodes in multiple states
Note: the long running reservation visible in the plot corresponds to the short QoS which is used to support small, short jobs with fast turnaround time.
Current System Load - GPU
- alloc: Nodes running user jobs
- idle: Nodes available for user jobs
- resv: Nodes in reservation and not available for standard user jobs
- plnd: Nodes are planned to be used for a future jobs. If pending jobs can fit in the space before the future job is due to start they can run on these nodes (often referred to as backfilling).
- down, drain, maint, drng, comp, boot: Nodes unavailable for user jobs
- mix: Nodes in multiple states
Service Alerts
The ARCHER2 documentation also covers some Known Issues which users may encounter when using the system.
| Status | Type | Start | End | Scope | User Impact | Reason |
|---|---|---|---|---|---|---|
| Planned | Service Alert | 2026-10-27 10:00 | 2026-11-03 16:00 | Compute nodes | Software may see different performance than usual | Testing the HPE PowerSched software to control system power draw |
| Planned | Service Alert | 2026-10-15 08:00 | 2026-10-29 18:00 | Slurm scheduler | Essential, two-stage update to Slurm scheduler |
Maintenance Sessions
This section lists recent and upcoming maintenance sessions. A full list of past maintenance sessions is available.
No scheduled or recent maintenance sessions
Previous Service Alerts
This section lists the five most recent resolved service alerts from the past 30 days. A full list of historical resolved service alerts is available.
| Status | Type | Start | End | Scope | User Impact | Reason |
|---|---|---|---|---|---|---|
| Resolved | Service Alert | 2026-10-22 23:00 | 2026-10-23 10:30 | Compute nodes | Around 1,700 compute nodes lost power. Jobs running on those nodes will have failed. We are working to bring the nodes back into service. | Temporary fluctuation in power supply at ACF data centre. |
| Resolved | Service Alert | 2026-10-22 14:30 | 2026-10-23 18:00 | Connectivity to all EPCC hosted services | Risk of interruption to connectivity to ACF services – most likely to be in the order of seconds. Running work will not be impacted. | Essential firewall maintenance |
| Resolved | Service Alert | 2026-10-20 09:00 | 2026-10-22 14:00 | ARCHER2 queues | Users may observe longer queue times for other work while some nodes are reserved for the Capability Days session. | The final ARCHER2 Capability Days session will run from 20-22 Oct 2026.If there is insufficient demand for the Capability Days session, the end time may be brought forward to reduce the impact on users wanting to run smaller production jobs. A user mailing will be sent one hour prior to closing the session. |
| Resolved | Service Alert | 2026-10-12 10:24 | 2026-10-12 12:26 | ARCHER2 compute nodes | Job interruption and reduced compute capacity | A power flicker has taken 600 compute nodes offline. Some jobs will have been interrupted and will be refunded, and compute capacity will be reduced until these nodes are restored to service. |
| Resolved | Service Alert | 2026-09-22 14:00 | 2026-09-24 09:00 | ARCHER2 queues | Users may observe longer queue times for work | Configuration of NCR system |
System Status mailings
If you would like to receive email notifications about system issues and outages, please subscribe to the System Status Notifications mailing list via SAFE
FAQ
Usage statistics
This section contains data on ARCHER2 usage for Sep 2026. Access to historical usage data is available at the end of the section.
Usage by job size and length
Queue length data
The colour indicates scheduling coefficient which is computed as [run time] divided by [run time + queue time]. A scheduling coefficient of 1 indicates that there was zero time queuing, a scheduling coefficient of 0.5 means that the job spent as long queuing as it did running.
Software usage data
Plot and table of % use and job step size statistics for different software on ARCHER2 for Sep 2026. This data is also available as a CSV file.
This table shows job step size statistics in cores weighted by usage, total number of job steps and percent usage broken down by different software for Sep 2026.
| Software | Min | Q1 | Median | Q3 | Max | Jobs | Nodeh | PercentUse | Users | Projects |
|---|---|---|---|---|---|---|---|---|---|---|
| Overall | 1 | 512.0 | 1024.0 | 6165.0 | 256000 | 1822055 | 4001792.0 | 100.0 | 848 | 107 |
| VASP | 1 | 256.0 | 512.0 | 1008.0 | 10240 | 98393 | 824694.7 | 20.6 | 148 | 13 |
| Unknown | 1 | 512.0 | 2048.0 | 16384.0 | 131072 | 354484 | 649613.2 | 16.2 | 428 | 80 |
| Met Office UM | 1 | 576.0 | 1152.0 | 6165.0 | 6624 | 82082 | 525167.8 | 13.1 | 63 | 9 |
| Nektar++ | 4 | 8192.0 | 8192.0 | 10368.0 | 12800 | 3726 | 219127.6 | 5.5 | 8 | 3 |
| LAMMPS | 1 | 128.0 | 2048.0 | 8192.0 | 131072 | 111465 | 207087.1 | 5.2 | 47 | 16 |
| No srun | 1 | 256.0 | 2304.0 | 8704.0 | 256000 | 203461 | 204601.0 | 5.1 | 674 | 89 |
| GROMACS | 1 | 240.0 | 512.0 | 1280.0 | 4096 | 15939 | 178621.5 | 4.5 | 38 | 7 |
| FHI aims | 1 | 256.0 | 512.0 | 1024.0 | 8192 | 51840 | 142335.4 | 3.6 | 28 | 5 |
| OpenFOAM | 1 | 640.0 | 1280.0 | 2048.0 | 16384 | 11554 | 138231.8 | 3.5 | 45 | 16 |
| CASTEP | 1 | 512.0 | 1280.0 | 2560.0 | 8192 | 450547 | 85686.8 | 2.1 | 29 | 5 |
| Python | 1 | 1280.0 | 16384.0 | 16384.0 | 16384 | 287751 | 79172.6 | 2.0 | 83 | 36 |
| Xcompact3d | 128 | 2048.0 | 5760.0 | 16384.0 | 32768 | 654 | 78314.9 | 2.0 | 6 | 2 |
| NEMO | 1 | 812.0 | 1890.0 | 5040.0 | 5504 | 9399 | 74000.9 | 1.8 | 22 | 3 |
| HYDRA | 1 | 2560.0 | 3200.0 | 99968.0 | 99968 | 102 | 72985.5 | 1.8 | 8 | 5 |
| ChemShell | 1 | 256.0 | 256.0 | 1024.0 | 4992 | 3304 | 71464.7 | 1.8 | 14 | 3 |
| CP2K | 1 | 128.0 | 576.0 | 1024.0 | 2048 | 85705 | 67391.5 | 1.7 | 29 | 4 |
| Quantum Espresso | 1 | 256.0 | 320.0 | 896.0 | 2048 | 21255 | 57418.7 | 1.4 | 35 | 8 |
| iIMB | 2304 | 2304.0 | 2304.0 | 2304.0 | 2304 | 184 | 38067.2 | 1.0 | 1 | 1 |
| MITgcm | 42 | 240.0 | 256.0 | 1152.0 | 3072 | 19465 | 37917.2 | 0.9 | 11 | 2 |
| EPOCH | 9 | 8192.0 | 8192.0 | 16384.0 | 32768 | 199 | 28621.7 | 0.7 | 8 | 2 |
| VAMPIRE | 128 | 5120.0 | 10240.0 | 12288.0 | 32768 | 518 | 27773.7 | 0.7 | 4 | 2 |
| Hydro3D | 150 | 1500.0 | 2000.0 | 2048.0 | 3000 | 114 | 22172.5 | 0.6 | 5 | 2 |
| GENE | 1 | 5376.0 | 8192.0 | 8192.0 | 8960 | 148 | 19925.1 | 0.5 | 4 | 4 |
| WRF | 4 | 384.0 | 384.0 | 384.0 | 384 | 390 | 18584.8 | 0.5 | 4 | 2 |
| CESM | 1 | 256.0 | 256.0 | 1152.0 | 1152 | 1251 | 15548.0 | 0.4 | 10 | 3 |
| CRYSTAL | 64 | 320.0 | 480.0 | 480.0 | 1024 | 272 | 13292.4 | 0.3 | 4 | 1 |
| PDNS3D | 128 | 1024.0 | 1024.0 | 6144.0 | 8192 | 155 | 12442.5 | 0.3 | 1 | 1 |
| Code_Saturne | 4 | 640.0 | 640.0 | 768.0 | 5120 | 442 | 11701.3 | 0.3 | 4 | 2 |
| ONETEP | 1 | 256.0 | 256.0 | 320.0 | 1024 | 1349 | 11106.9 | 0.3 | 9 | 2 |
| RMT | 1024 | 1664.0 | 1792.0 | 1792.0 | 3584 | 278 | 10713.4 | 0.3 | 4 | 1 |
| SENGA | 128 | 1024.0 | 1536.0 | 2048.0 | 2048 | 127 | 10666.1 | 0.3 | 3 | 3 |
| GS2 | 32 | 768.0 | 1856.0 | 1856.0 | 2880 | 297 | 7542.6 | 0.2 | 5 | 2 |
| 3DNS | 11550 | 11550.0 | 11550.0 | 11550.0 | 11550 | 5 | 6646.5 | 0.2 | 1 | 1 |
| SIESTA | 1 | 512.0 | 512.0 | 2304.0 | 2304 | 479 | 6546.9 | 0.2 | 5 | 2 |
| OpenSBLI | 384 | 4608.0 | 4608.0 | 4608.0 | 131072 | 2536 | 6481.4 | 0.2 | 2 | 2 |
| Nek5000 | 128 | 1024.0 | 2048.0 | 2048.0 | 2048 | 75 | 5358.4 | 0.1 | 3 | 2 |
| a.out | 1 | 1152.0 | 131072.0 | 131072.0 | 131072 | 752 | 4277.2 | 0.1 | 6 | 3 |
| TPLS | 1024 | 2048.0 | 2048.0 | 2048.0 | 2048 | 101 | 4029.6 | 0.1 | 1 | 1 |
| NAMD | 4 | 512.0 | 512.0 | 512.0 | 512 | 43 | 2518.1 | 0.1 | 1 | 1 |
| Smilei | 16 | 128.0 | 128.0 | 128.0 | 1024 | 33 | 1349.8 | 0.0 | 2 | 1 |
| NWChem | 128 | 256.0 | 256.0 | 512.0 | 512 | 97 | 1253.7 | 0.0 | 5 | 1 |
| DL_POLY | 32 | 64.0 | 64.0 | 512.0 | 512 | 97 | 694.4 | 0.0 | 2 | 1 |
| OSIRIS | 512 | 1024.0 | 1024.0 | 1024.0 | 1024 | 25 | 277.5 | 0.0 | 1 | 1 |
| Zacros | 1 | 144.0 | 225.0 | 400.0 | 400 | 456 | 139.3 | 0.0 | 2 | 2 |
| BOUT++ | 768 | 768.0 | 768.0 | 768.0 | 768 | 12 | 108.0 | 0.0 | 1 | 1 |
| AxiSEM3D | 128 | 1280.0 | 1280.0 | 1280.0 | 1280 | 14 | 76.1 | 0.0 | 1 | 1 |
| Arm Forge | 1 | 128.0 | 128.0 | 128.0 | 1280 | 133 | 34.6 | 0.0 | 4 | 4 |
| ptau3d | 8 | 32.0 | 32.0 | 80.0 | 80 | 13 | 5.4 | 0.0 | 2 | 1 |
| ludwig | 8 | 8.0 | 8.0 | 8.0 | 8 | 64 | 2.8 | 0.0 | 1 | 1 |
| UKRmol+ | 1 | 4.0 | 4.0 | 4.0 | 4 | 256 | 1.0 | 0.0 | 2 | 1 |
| PRECISE | 8 | 8.0 | 8.0 | 8.0 | 8 | 14 | 0.0 | 0.0 | 1 | 1 |
