Maintenance Notification – Summit Denver Data Center We would like to inform you of scheduled maintenance that may temporarily affect your service. Dates Start: October 1st, 2024, 8:00 PM MDT End: October 2nd, 2024, 6:00 AM MDT Details We will be performing essential maintenance on critical equipment at our Summit Denver Data Center from the evening of October 1st through the morning of October 2nd. Our team, in coordination with the data center staff, will take every measure to minimize any disruptions to your service. However, there is a possibility of brief interruptions during this period. If you have any questions or need assistance, please don't hesitate to contact our support team by submitting a ticket. We will keep you updated throughout the process. Thank you for your understanding and continued partnership.

The following advisory is being sent to you to inform you of upcoming critical maintenance work that may impact your service. Dates MTS 1D Power Cutover 10/24/24 8:00 AM MST MTS 2C Power Cutover 10/24/24 10:00 AM MST STS 1D Restoration 11/5/24 8:00 AM MST STS 2C Restoration 11/5/24 10:00 AM MST MTS 1C Power Cutover 11/11/24 8:00 AM MST MTS 2D Power Cutover 11/11/24 10:00 AM MST STS 1C Restoration 11/20/24 8:00 AM MST STS 2D Restoration 11/20/24 10:00 AM MST Please be advised that outside contractors will commence a project to upgrade the electrical switch gear in the East Data Center. As part of this project, electrical circuits supporting customer racks will temporarily be switched to an alternate power source, before being restored to their primary source upon project completion. Although the contractors expect this work to have no impact on services, the activity is classified as high-risk due to its potential to affect critical loads. For racks with both primary and secondary power feeds, only one circuit will be impacted at a time, with the alternate circuit remaining operational during each cutover. However, for racks relying solely on a primary power source or devices with single power cords, the risk to these components is elevated. Risk Exposure: • Potential restart of single-corded equipment • Potential restart of dual-corded equipment with a failed PSU • Possible business disruption in the event of a device restart or failure Project Monitoring: On the dates mentioned above, Summit Hosting's engineering team will be onsite, actively monitoring the electrical systems supporting your equipment. While we do not anticipate any interruptions to normal service, given the nature of this operation, it remains classified as high-risk. Our technicians will be available to assist with any issues that may arise during this maintenance. If you have any questions or concerns regarding this advisory, please feel free to submit a ticket or contact our Network Operations Center at noc@summithosting.com. Warm regards, Summit Hosting DTC Operations Team