Data Centre Technician Interview Questions UK: 8 Real Questions and What Interviewers Want

Most Data Centre Technician interviews in the UK follow a pattern, and knowing it beats guessing. Below are eight questions from our bank of 16, each with a note on what the interviewer is really after.

Eight Data Centre Technician interview questions, and what the interviewer is thinking

1. What is the difference between a rack server, a blade server and a hypervisor host, and how would you install a server in a rack?

Why they ask: To check basic hardware knowledge and practical installation skill.

2. How do you replace a failed hard drive in a server with RAID, and why does the RAID level matter?

Why they ask: To assess hands-on fault resolution and understanding of resilience.

3. What environmental and physical controls would you expect to find in a well-run data centre?

Why they ask: To test understanding of facility resilience and security.

4. How do structured cabling and patching work in a data centre, and what standards would you follow?

Why they ask: To check cabling competence and attention to detail.

5. What is DCIM, and how would you use monitoring tools to spot problems before they cause an outage?

Why they ask: To test awareness of tooling and proactive operations.

6. You arrive for a shift and see a high-temperature alarm on a row of racks. What do you do?

Why they ask: To test reaction to environmental incidents.

7. Tell me about a time you found and fixed a hardware or infrastructure fault under time pressure.

Why they ask: To see practical troubleshooting and composure.

8. Why do you want to work as a data centre technician, and what does a typical shift involve?

Why they ask: To test motivation and realistic understanding of the job.

A sample answer to question 1

What is the difference between a rack server, a blade server and a hypervisor host, and how would you install a server in a rack?

A rack server is a standalone unit measured in U heights, typically 1U or 2U, with its own power, storage and network ports. A blade server is a slim compute module that slots into a shared chassis supplying power, cooling and networking, which gives high density. A hypervisor host is simply a physical server running software like VMware ESXi or Hyper-V to host multiple virtual machines. To rack a server, I would check the rack's available U space, power capacity and cooling, then fit the rails, lift the server with a second person or a server lift, and secure it. I would connect redundant power cables to separate PDUs, dress the network cabling neatly with labels on both ends, and update the asset register and DCIM tool. Finally I would confirm remote management access, such as iDRAC or iLO, before handing over.

Common mistake to avoid: Skipping power and cooling checks; Lifting heavy kit alone

Want the rest?

Full model answers, key points and common mistakes for all 16 questions are on the Data Centre Technician interview questions page. The first five are free, no sign-up needed.