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When possible these are done in a rolling update to avoid complete system outages, but it can require and entire unplanned outage. In these cases customers are promptly notified of the plan, and the outage will be posted on the NCSA service status page unless further discretion is required by the customer.
Special Requests
Customers may have special requests for new features, service or updated packages or libraries. If this is any change beyond a simple update of a minor software version, it goes through the standard change control process. Otherwise a ticket with the request is sufficient, and it is at the Systems Team's discretion how and when to roll out the update.