Colocation or Cloud? Making the Right Call in Data Centre Modernisation

When an in-house server room ages, hardware approaches end of life, or power and cooling costs start to strain the budget, IT teams face the same question: where, and under which model, should our infrastructure run? There are usually three options. Move existing hardware to a professional data centre (colocation), move workloads to the cloud, or combine the two. In this article we compare colocation and cloud, explain when each makes sense, and show how to plan data centre modernisation in phases.

What is colocation?

Colocation means hosting your own server, storage and network hardware in a professional data centre. The hardware is yours. The data centre provides infrastructure services such as power, cooling, physical security and network connectivity. You avoid the burden of building and operating your own data centre while keeping control over your hardware and software.

Colocation is not an operations service on its own. Unless agreed separately, managing the servers, operating systems and applications remains your responsibility.

What is cloud (IaaS)?

With IaaS (Infrastructure as a Service) you do not own the hardware. You consume compute, memory, storage and network resources as needed and pay a service fee. Maintaining, refreshing and capacity-planning the physical infrastructure is the provider's responsibility. You manage your virtual servers, operating systems and applications.

Colocation vs cloud at a glance

The key difference is who owns the hardware and how capacity grows. In both models, responsibility for physical infrastructure moves out of your premises.

When does colocation make sense?

• You have new hardware that is still being depreciated: You run the investment in a professional environment instead of writing it off.
• You depend on specialised hardware or licences: It suits systems that need specific server models, hardware security modules or hardware-bound licences.
• Workloads are predictable and stable: If capacity needs barely change over the years, owned hardware can be economical.
• You want to close your own server room: You hand over power, cooling and physical security without changing your architecture.

When does cloud make sense?

• Capacity needs fluctuate: For seasonal peaks, projects or rapid growth, you use only what you need.
• A hardware refresh is due: Moving to a service model instead of a new capital investment eases cash flow.
• You need new environments quickly: Test, development and pilot environments can be created in minutes rather than days.
• You want your team to focus on applications, not hardware: Hardware failures, part replacement and capacity planning move to the provider.

For most organisations, the answer is hybrid

In practice, many organisations use both. Systems tied to specialised hardware, or risky to change, stay in colocation. Fluctuating, new or fast-scaling workloads move to the cloud. Connecting the two environments within the same data centre ecosystem or over a low-latency link lets applications talk to each other smoothly. This is also the most controlled way to start modernising without a single big-bang migration.

Criteria to weigh before deciding

1. Total cost of ownership: Compare hardware, licences, hosting, power, maintenance and staff costs over a 3–5 year period. Looking only at the monthly fee can be misleading.
2. Hardware lifetime: The remaining life and warranty status of your current hardware determine how long colocation will make sense.
3. Data location and compliance: Where your data is stored is critical for KVKK (Turkey's data protection law) and sector regulations such as BDDK rules. Ask for the location to be stated explicitly in the contract.
4. Availability and redundancy: Verify the data centre's power, cooling and network redundancy, and any independent classifications or certifications, in writing at the proposal stage.
5. Connectivity options: Carrier diversity, bandwidth and private connectivity to the cloud are decisive for hybrid scenarios.
6. Operating model: Who will run the hardware and systems day to day? Make sure monitoring scope and incident response commitments are defined separately.
7. Exit and growth plan: Cabinet/space expansion, contract term and future cloud migration options should be discussed up front.

Data centre modernisation: a phased approach

The colocation-or-cloud decision works best as part of a wider modernisation plan. A sound modernisation usually goes through four phases:

1. Current-state assessment: Server, storage, network and application inventories are built. Dependencies, hardware lifetimes and costs are identified.
2. Target design: You decide which workloads stay in colocation, which are virtualised and consolidated, and which move to the cloud.
3. Phased migration: Moves are carried out in waves that protect business continuity. Each wave has a test and rollback plan.
4. Optimisation: The new environment is monitored, and resource usage, cost and performance are improved continuously.

Virtualisation and consolidation can reduce the amount of hardware moved into colocation, lowering both cabinet and power costs. That is why assessing modernisation opportunities before a move usually pays off.

Colocation and modernisation with Cloud Expert

Cloud Expert can offer colocation together with managed infrastructure services, so your hardware is hosted in a professional data centre while operations support comes from the same partner. In hybrid scenarios we position colocation and cloud infrastructure together, and we run modernisation through a phased plan that protects business continuity.

For details, see our Colocation and Data Centre Modernisation pages, and for the cloud side our IaaS and Hybrid Cloud pages. For migration planning, see our Infrastructure Migration service.