MACC Service Expectations

Maintenance is performed at the MACC in order to prevent unexpected outages. Maintenance windows provide predictable schedules for staff and customers. The guidelines below are based on MACC Operations and Operations Committee requirements.

Maintenance Windows

MACC Maintenance windows are scheduled quarterly to accommodate the performance of medium and high risk maintenance work. Low risk work may also be scheduled and performed during the maintenance windows, though it may also be performed outside of maintenance windows.

Current status updates for all planned maintenance and unplanned outages can be found on the ITS Service Status website. 


Type of Work Examples Timing
Low Risk

Work that while critical can be done with little or no risk to operations. 

Example:  preventative maintenance to one of the CRAC units. We have 3 redundant CRAC units in the room (to give us N+1), so taking any one unit down does not affect overall cooling.

If impact to building occupants:
Perform work outside business hours
(7 a.m.–7 p.m., Monday–Friday)

If no impact to building occupants: Perform work anytime

Medium Risk

Work that can put the data center itself or some other building occupant at risk. 

Example: Mechanical maintenance to the rooftop dry coolers. Taking down a flywheel unit does not have a direct risk on the data center, but it reduces the redundancy and affects the length of time that the flywheels can support data center operations.

Perform during quarterly maintenance window
High Risk

Work that either can or definitely would affect either the building as a whole, or the data center specifically.

Examples: Shutting down utility power (DTE), taking more than one generator off-line, or required testing of the generator control system.

Perform during quarterly maintenance window

Schedule and Policies

  • Occurs four weekends each year during the months of February, May, August and November.
  • Begins on the third Friday of the month.
  • In the event that this occurs during an ITS Production Freeze, the window will be moved to the second or fourth Friday.
  • Begins no earlier than Friday at 7 p.m.
  • High risk work to be performed between 8 p.m. and 6 a.m.
  • Medium risk work may be performed during the entire weekend window.
  • If there is noisy maintenance that is planned for 7 a.m.–11 p.m. that could impact the other building occupants and the building Conference Center, their approval is required.