- 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.
No current service alerts
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 | 2026-03-11 09:00 | 2026-03-11 10:00 | ARCHER2 service power | Low probability risk of power interruptions | Routine generator load testing |
| Resolved | Service Alert | 2026-03-10 08:00 | 2026-03-11 09:50 | ARCHER2 Service Planned Maintenance outage |
The ARCHER2 Service will be down from 08:00 to midnight to allow the certificates to be updated There has been a delay in the planned return to service. Further updates will be provided this morning (Wed 11th). We apologise for this delay. |
Certificate update |
| Resolved | Service Alert | 2026-03-04 15:30 | 2026-03-04 16:45 | Jobs from projects on a2fs-work3 file system | Projects on Lustre a2fs-work3 file system will not be able to submit jobs and recent josb may have failed. | Ongoing failover issues on one Lustre file system (a2fs-work3). |
| Resolved | Service Alert | 2026-03-04 15:00 | 2026-03-05 13:00 | ARCHER2 service power | Very low risk of loss of power to login nodes, management nodes, file systems | Routine generator load testing |
| Resolved | Service Alert | 2026-02-18 08:30 | 2026-02-18 11:30 | ARCHER2 scheduling | Low probability risk of issues with scheduling or running jobs | High priority security update |
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 Feb 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 Feb 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 Feb 2026.
| Software | Min | Q1 | Median | Q3 | Max | Jobs | Nodeh | PercentUse | Users | Projects |
|---|---|---|---|---|---|---|---|---|---|---|
| Overall | 1 | 512.0 | 1024.0 | 4096.0 | 131072 | 5031628 | 3895583.8 | 100.0 | 1018 | 118 |
| Unknown | 1 | 768.0 | 1280.0 | 8192.0 | 99687 | 2981633 | 816181.9 | 21.0 | 525 | 91 |
| VASP | 1 | 504.0 | 512.0 | 1152.0 | 8192 | 206387 | 802970.8 | 20.6 | 163 | 15 |
| Met Office UM | 1 | 576.0 | 1152.0 | 6165.0 | 6165 | 46131 | 327648.0 | 8.4 | 67 | 4 |
| No srun | 1 | 512.0 | 3200.0 | 32768.0 | 131072 | 104634 | 278742.5 | 7.2 | 778 | 98 |
| LAMMPS | 1 | 128.0 | 256.0 | 512.0 | 131072 | 32264 | 165984.8 | 4.3 | 54 | 18 |
| GROMACS | 1 | 512.0 | 1024.0 | 1024.0 | 2560 | 24960 | 128190.9 | 3.3 | 38 | 7 |
| FHI aims | 1 | 512.0 | 1024.0 | 1024.0 | 3584 | 44602 | 118292.9 | 3.0 | 28 | 5 |
| Python | 1 | 1280.0 | 9216.0 | 16384.0 | 64000 | 151110 | 114202.7 | 2.9 | 63 | 28 |
| NEMO | 1 | 480.0 | 480.0 | 5504.0 | 10080 | 1136912 | 112152.0 | 2.9 | 25 | 4 |
| OpenFOAM | 1 | 512.0 | 768.0 | 1920.0 | 12800 | 17958 | 108616.6 | 2.8 | 50 | 20 |
| Nektar++ | 4 | 5120.0 | 8192.0 | 10240.0 | 10240 | 232 | 107065.9 | 2.7 | 9 | 4 |
| SENGA | 1 | 6480.0 | 8192.0 | 8192.0 | 8192 | 162 | 101185.9 | 2.6 | 6 | 3 |
| ONETEP | 1 | 256.0 | 300.0 | 2048.0 | 2048 | 1237 | 87450.9 | 2.2 | 5 | 2 |
| CASTEP | 1 | 256.0 | 420.0 | 512.0 | 9216 | 99197 | 83547.2 | 2.1 | 33 | 6 |
| ChemShell | 1 | 1024.0 | 12800.0 | 12800.0 | 12800 | 2213 | 82940.2 | 2.1 | 17 | 4 |
| CP2K | 7 | 256.0 | 512.0 | 1024.0 | 8960 | 37052 | 81528.7 | 2.1 | 33 | 6 |
| Quantum Espresso | 1 | 256.0 | 768.0 | 1280.0 | 4096 | 17978 | 40120.4 | 1.0 | 49 | 7 |
| Code_Saturne | 32 | 1024.0 | 8192.0 | 8192.0 | 8192 | 248 | 38425.3 | 1.0 | 6 | 2 |
| MITgcm | 4 | 112.0 | 240.0 | 240.0 | 1000 | 25778 | 32707.4 | 0.8 | 17 | 3 |
| CRYSTAL | 1 | 512.0 | 1024.0 | 1024.0 | 2048 | 260 | 30463.5 | 0.8 | 9 | 5 |
| CESM | 1 | 512.0 | 768.0 | 1920.0 | 6400 | 1074 | 27693.1 | 0.7 | 10 | 2 |
| GENE | 1 | 8192.0 | 10240.0 | 10240.0 | 10240 | 5672 | 25921.7 | 0.7 | 5 | 3 |
| iIMB | 2304 | 2304.0 | 2304.0 | 2304.0 | 2304 | 64 | 25068.7 | 0.6 | 1 | 1 |
| OpenSBLI | 128 | 64000.0 | 64000.0 | 64000.0 | 131072 | 48 | 24265.8 | 0.6 | 4 | 3 |
| PeleLMeX | 128 | 2048.0 | 2048.0 | 3072.0 | 4096 | 192 | 21334.1 | 0.5 | 3 | 1 |
| WRF | 128 | 384.0 | 384.0 | 384.0 | 384 | 107 | 20974.8 | 0.5 | 3 | 2 |
| GAMESS | 128 | 128.0 | 128.0 | 128.0 | 128 | 726 | 18247.1 | 0.5 | 9 | 1 |
| TPLS | 512 | 4096.0 | 4096.0 | 4096.0 | 4096 | 58 | 11950.1 | 0.3 | 2 | 1 |
| EPOCH | 128 | 640.0 | 1024.0 | 1280.0 | 2048 | 1068 | 11833.8 | 0.3 | 9 | 1 |
| NAMD | 1 | 256.0 | 288.0 | 512.0 | 640 | 1796 | 10775.8 | 0.3 | 5 | 3 |
| SIESTA | 9 | 2304.0 | 2304.0 | 2304.0 | 2304 | 71 | 6898.0 | 0.2 | 2 | 2 |
| Xcompact3d | 128 | 1024.0 | 16384.0 | 16384.0 | 16384 | 105 | 5523.3 | 0.1 | 6 | 5 |
| a.out | 1 | 32.0 | 1024.0 | 1024.0 | 2048 | 1319 | 3236.1 | 0.1 | 16 | 6 |
| AxiSEM3D | 128 | 2560.0 | 7680.0 | 7680.0 | 102400 | 1008 | 3044.8 | 0.1 | 2 | 1 |
| VAMPIRE | 128 | 1024.0 | 1024.0 | 1024.0 | 1024 | 342 | 2894.0 | 0.1 | 5 | 2 |
| OSIRIS | 1024 | 1024.0 | 1024.0 | 1024.0 | 1024 | 9 | 2622.4 | 0.1 | 1 | 1 |
| ludwig | 1 | 512.0 | 512.0 | 512.0 | 512 | 1136 | 2439.8 | 0.1 | 2 | 2 |
| Nek5000 | 1024 | 1024.0 | 1024.0 | 1024.0 | 2048 | 40 | 2392.0 | 0.1 | 2 | 1 |
| DL_POLY | 32 | 1024.0 | 1024.0 | 1024.0 | 1024 | 62 | 2182.4 | 0.1 | 3 | 2 |
| RMT | 1280 | 1280.0 | 1792.0 | 1792.0 | 2560 | 79 | 2089.9 | 0.1 | 2 | 1 |
| NWChem | 8 | 128.0 | 128.0 | 128.0 | 512 | 82255 | 1887.0 | 0.0 | 15 | 7 |
| Hydro3D | 120 | 2000.0 | 2000.0 | 2048.0 | 2048 | 74 | 1702.5 | 0.0 | 2 | 2 |
| GS2 | 480 | 2040.0 | 2040.0 | 2040.0 | 2160 | 34 | 912.3 | 0.0 | 3 | 1 |
| PDNS3D | 1024 | 1024.0 | 1024.0 | 1024.0 | 1024 | 168 | 709.1 | 0.0 | 2 | 1 |
| FDS | 192 | 248.0 | 248.0 | 440.0 | 440 | 12 | 285.5 | 0.0 | 1 | 1 |
| DL_MESO | 32 | 32.0 | 32.0 | 32.0 | 32 | 29 | 133.2 | 0.0 | 1 | 1 |
| Amber | 64 | 64.0 | 64.0 | 64.0 | 64 | 15 | 72.0 | 0.0 | 1 | 1 |
| Arm Forge | 1 | 512.0 | 1280.0 | 1280.0 | 1280 | 197 | 23.2 | 0.0 | 10 | 10 |
| HYDRA | 1 | 30.0 | 30.0 | 1280.0 | 4096 | 300 | 17.3 | 0.0 | 8 | 5 |
| ptau3d | 2 | 64.0 | 160.0 | 160.0 | 160 | 339 | 14.6 | 0.0 | 3 | 2 |
| ABINIT | 16 | 16.0 | 128.0 | 128.0 | 128 | 13 | 10.1 | 0.0 | 1 | 1 |
| Smilei | 2 | 64.0 | 64.0 | 64.0 | 64 | 45 | 8.6 | 0.0 | 3 | 1 |
| SBLI | 128 | 128.0 | 128.0 | 128.0 | 128 | 2130 | 2.3 | 0.0 | 1 | 1 |
| UKRmol+ | 1 | 2.0 | 4.0 | 4.0 | 4 | 76 | 0.0 | 0.0 | 1 | 1 |
| PRECISE | 1 | 1.0 | 1.0 | 1.0 | 2 | 17 | 0.0 | 0.0 | 1 | 1 |
