Current System Load

The plot below shows the status of the CPU nodes on the current Cirrus service for the past day (note: the Cirrus GPU nodes are not included in this plot).

A description of each of the status types is provided below the plot.


Cirrus Node Status graph


Cirrus GPU Node Status graph

Known Issues

We are experiening a heavy load on the metadata server. Our systems team are investigating but we suspect this is due to user(s) performing many I/O operations. We apologise for the inconvenience this is causing users.

Service Alerts

No current service alerts

Recently Resolved Service Alerts

This table lists 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 2024-06-10 10:50 2024-06-11 14:00 Solid State file system, RPOOL Scratch file system unavailable. Unknown - systems teams are investigating
Resolved Service Alert 2024-05-27 03:09 2024-05-27 14:45 Cirrus compute nodes Compute nodes are unavailable, any jobs running at the time of the power incident will have failed Power incident on UK national grid in the Edinburgh area resulted in loss of power to Cirrus compute nodes
Resolved Service Alert 2024-05-22 11:30 2024-05-22 14:15 Access to License server The License server is inaccessible - our team are working to restore

Service Calendar and Maintenance

This section lists recent and upcoming maintenance sessions. A full list of past maintenance sessions is available.

Status Type Start End Scope User Impact Reason
Resolved Full 3 June 2024 08:00 4 June 2024 11:00 Cirrus No login access
No access to any data on the system
Jobs will not run.
Cooling Ditribution Unit (CDU) maintenance for Cirrus. System will be brought back with new boot image which includes an updated CUDA driver.

Maintenance Logs for previous periods

Previous maintenance logs

At Risk Maintenance Sessions

There is an ‘At-Risk’ Session provisionally booked every Wednesday from 1000 - 1200. A user mailing will be sent if any work is going to take place which may impact users.

Service Calendar

We maintain a calendar for the Cirrus service that lists upcoming events (such as training courses and maintenance sessions):

We keep maintenance downtime to a minimum on the service but do occaisionally need to perform essential work on the system. Maintenance sessions are used to ensure that:

Additional maintenance sessions can be scheduled for major hardware or software updates; major upgrades to facility plant and infrastructure; acceptance testing following major service upgrades and statutory electrical testing.