Undervoltage Event Affecting Cooling Systems at NL1 Kolo DC Dronten

Dear Customer,

We want to inform you of a recent event that occurred at our NL1 Dronten location this morning. The facility experienced an undervoltage event on the utility power feed, which temporarily impacted some cooling systems within the data center.

What Happened

An undervoltage condition on the incoming utility power was detected, which led to a brief degradation in the operation of our cooling infrastructure. Our monitoring systems alerted us immediately, and our on-site engineering team responded promptly.

Impact:

Cooling System: Cooling performance was reduced for approximately 15 minutes.

Customer Services: At this time customers may have noticed elevated temperatures or performance alerts.

Resolution:
Full cooling capacity was restored after taken actions. All systems are now operating normally.

Next Steps:

We are closely monitoring the environment to ensure continued stability. A root cause analysis is in progress and a Reason For Outage will be created in the next days.

Location = NL1, Dronten, NL

Start: 02-08-2025 07:15 CEST Amsterdam time
End:   -

If you have any questions, please don’t hesitate to contact our facility team. Thank you for your understanding.

Alfred van den Berg

Walk-around inspection UPS system A/B-feed KOLO NL2 Meppel

Dear Customer,

We would like to inform you about an upcoming visual inspection:
Location = NL2, Meppel, NL
Service Type = walk-around inspection

Start: 31.07.2025 09:00 CEST Amsterdam time
End: 31.07.2025 13:00


Impact: low,
Expected Outage: none

If you have any questions, please don’t hesitate to contact our facility team. Thank you for your understanding.

Alfred van den Berg

facility@kolodc.com

Dark fiber maintenance of our supplier “Relined” PA-179002

Dear Customer,

Our dark fiber supplier ”Relined” will do a Service-Affecting maintenance PA-179002.

Location: Serverius NL3, Apeldoorn, NL – Nikhef, Amsterdam, NL
Service Type: Dark fiber

Start: 2025-08-29 00:00:00 CET
End: 2025-08-29 06:00:00 CET
Duration: 6 hours.

Reason: Relined performs maintenance work to maintain the availability and quality of its fiber optic network.

This activity will impact the following dark fiber circuits: NL3, Apeldoorn, NL <-> Nikhef, Amsterdam, NL

Expected Outage: is the expected downtime of DWDM channels from the Serverius NL3, Apeldoorn to Nikhef, Amsterdam only. No expected outage for IP transit service, other dark fibers will automatically take over the data traffic, but there is a slight chance for high latency and short time packet loss in the time of rebuilding routing tables.

We apologize in advance for any inconvenience this might cause.

Planned Maintenance – Cooling System at NL3 Apeldoorn

Dear Customer,

We would like to inform you about scheduled maintenance on the cooling infrastructure at our NL3 data center in Apeldoorn. This planned work is part of our regular upkeep and is not expected to impact the availability of your services.

Maintenance Details:

  • Schedule:
    From 29 July 2025 to 31 July 2025
    Daily between 09:00 and approximately 17:00 CEST
  • Location: NL3, Apeldoorn, The Netherlands
  • Scope: Cooling infrastructure maintenance
  • Service Impact: Expected to be minimal. All systems will remain at least in their standard redundancy state (N).
  • Outage: None anticipated

Should you have any questions, please don’t hesitate to contact our support team. Thank you for your understanding.

Unplanned maintenance airco system Main Distributor room c-feed NL2 Serverius Meppel

Dear Customer,

We would like to inform you about an unplanned maintenance:
Location = NL2, Meppel, NL
Service Type = unplanned maintenance  airco system Main Distributor room c-Feed

Start: 13.07.2025 14:15 CEST Amsterdam time
End: 13.07.2025 16:30 –


Impact: low, installing extra backup cooling
Expected Outage: none

If you have any questions, please don’t hesitate to contact our facility team. Thank you for your understanding.

Alfred van den Berg

facility@serverius.net