Availability and planned maintenance

General availability

Every reasonable effort will be made to keep ABACUS 2.0 available and operational 24 hours per day and 7 days per week.

Please note, however, that although the support personnel will do their best to keep the HPC facility running at all times, we cannot guarantee to promptly resolve problems outside Danish office hours (9:00-15:00), and during weekends and public Danish holidays. Nevertheless, please notify support of issues whenever they arise.

The service is provided “as is” and we can’t guarantee 100% perfection. In legal terms, this means that we are excluding all warranties and conditions applying to the service, including those implied by law. We are not liable if things go wrong and you suffer damage as a result, although if our negligence results in anyone’s death or personal injury we do not limit or exclude our liability for that.

The backup policies we will follow are good and secure, and will cover most conceivable eventualities, but it is impossible to be 100% certain. Our recommendation is that in using the service you should take the usual precautions you would take with any computer system: keep copies of essential data and codes, copy your most important results away to your home machine, and so on. Almost certainly, all this will be unnecessary, but it is as well to be sure.

Planned maintenance

Occasionally it is necessary as part of maintaining a reliable service to update system software and replace faulty hardware. Sometimes it will be possible to perform these tasks transparently by means of queue reconfiguration in a way that will not disrupt running jobs or interactive use, or significantly inconvenience users. Some tasks however, particularly those affecting storage or login nodes, may require temporary interruption of service.

Where possible, maintenance activities involving a level of disruption to service will be scheduled on:

Wednesdays 8:00 to 18:00 (local Danish time).

Please note that this does not mean that there will be disruption at this time every week, merely that if potentially disruptive maintenance is necessary we will do our best to ensure it takes place during this period, in which case there will be advance notification.

Establishing a predictable time slot for planned maintenance has the advantage that users may be confident that `dangerous’ changes will not intentionally be undertaken at other times. Unfortunately, the potential for unplanned periods of disruption is a fact of life – please see the next section.

Exceptional maintenance and unplanned disruptions

It may happen that despite best efforts, it becomes necessary to reduce or withdraw service at short notice and/or outside the planned maintenance time slot. This may happen e.g. for environmental reasons, such as air conditioning or power failure, or in an emergency where immediate shutdown is required to save equipment or data. Obviously in such cases service will be restored as rapidly as possible.