Maintenance Policy

Maintenance work is necessary from time to time to keep the security, performance and functionality of services up to date and to adapt them to new requirements. This may also have to be done at short notice.
IT always strives to set up services in such a way that maintenance work has little or no impact on users.
IT strives to perform maintenance not on Fridays and not before Monday afternoon.

If a maintenance job cannot be done without impact, then we typically organize in advance:
- Can maintenance work be grouped together so that the number of maintenance operations is minimized?
- Are there provisional risk reduction options for acute safety issues?
- Consultation with CUC and the major using groups of people, especially in operations (accelerators, experiments, ...), which times are not suitable for concrete maintenance. Some of these groups of people work 24/7.

Some work is done during normal working hours. Why?
- After consideration, some restrictions are considered minor and acceptable during working hours.
- If problems occur, more help is available: e.g. UCO, IT specialists on the part of DESY as well as on the part of the manufacturer.
- It may make sense that the malfunction affects the users and IT experts during the day, and not the IT night standby.
- Due to the 24/7 nature of the operation and globally distributed users, night or weekend work would also affect users, who would then be left without regular communication and contact persons.

Major interventions (e.g. network maintenance in the data center) are made outside regular core working hours.

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