(maintenance)=

# ARC Maintenance Outages
ARC systems will be taken offline regularly to perform essential maintenance tasks which are unreasonable to perform during normal operations. During these outages, the systems will be inaccessible to researchers and students and jobs will not run.

## Regular Cycle
Starting in 2023, ARC established an annual senquence of maintenance outages at regular intervals to help make these service interruptions more predictable. Each year there will be three planned maintenance outages. The exact dates will vary from year to year but follow this pattern:

| Maintenance | Occurence | Duration |
| ----- | ----- | ----- |
| Winter| First week of the Spring Semester | 3 days |
| Summer | Mid-May, The week after VT Spring commencement | 5 days |
| Fall | Early-August 1-2 weeks before start of classes  | 3 days |

## 2023 Maintenance Dates

| Maintenance | Occurence | Duration | Summary Info |
| ----- | ----- | ----- | ----- |
| Winter| January 17-19, 2023 (Tu-Th) | 3 days | |
| Summer | May 15-19, 2023 (M-F) | 5 days | [Notes](system-changes-jan23) |
| Fall | August 14-16, 2023 (M-W) | 3 days | |

## 2024 Tentative Maintenance Dates
```{note}
These tentative dates are subject to changes in the VT academic calendar.
```
| Maintenance | Occurence | Duration |
| ----- | ----- | ----- |
| Winter| January 16-18, 2024 (Tu-Th) | 3 days |
| Summer | May 13-17, 2024 (M-F) | 5 days |
| Fall | August 19-21, 2024 (M-W) | 3 days |