What is Colocation? Server Hosting Service Guide

What is Colocation? Server Hosting Service Guide

Colocation (or "colo") means placing your own physical server in a data center and using that center's infrastructure — power, cooling, internet connectivity, and physical security. In short: the hardware is yours, the infrastructure belongs to the data center.

This model is ideal for businesses that want to own their own servers but want to avoid the costs and risks of hosting them in their own office or building.

How Does Colocation Work?

Colocation Model:

You                    Data Center
─────────────────      ──────────────────────────
Physical server   →    Rack space (1U, 2U, 4U...)
Hardware maintenance → Power (electricity + UPS)
Software management → Cooling system
Data management   →    Internet connectivity
                  →    Physical security
                  →    Fire suppression
                  →    24/7 NOC (Network Operations Center)

You deliver or ship your server to the data center. The center places your server in a rack, provides power and network connectivity. You then manage your server remotely (via SSH, RDP, or IPMI/iDRAC).

Colocation vs Other Options

Colocation vs Cloud

Colocation vs Dedicated Server Rental

Colocation vs VDS

VDS operates in a virtualized environment and resources are shared (even if dedicated in VDS, the physical hardware is shared). In colocation, all physical hardware belongs exclusively to you.

Performance Comparison:
VDS:         Has virtualization overhead
Colocation:  Bare-metal performance, no virtualization

Advantages of Colocation

1. Full Hardware Control

You choose your own hardware. You can use any CPU, RAM, disk, and network card you want. You can install custom GPUs, FPGAs, or specialized network equipment.

2. Economical in the Long Run

You buy the hardware once. Your monthly payment only covers rack space, electricity, and bandwidth. Over a 3-5 year perspective, it can be much more economical than dedicated rental or cloud.

3. Data Security and Compliance

Your data physically resides on your hardware. You have full control over data location and ownership for KVKK, GDPR, or industry regulations.

4. High Performance

Offers bare-metal performance. There is no virtualization overhead. Especially ideal for databases requiring high I/O, big data processing, and AI/ML workloads.

5. Customizable Network Configuration

You can use your own BGP AS number, manage your IP blocks, and create custom VLAN configurations.

Disadvantages of Colocation

1. High Initial Cost

You need to purchase server hardware. An enterprise-class server can cost tens of thousands.

2. Hardware Maintenance Responsibility

When hardware fails, you are responsible. For situations like disk replacement or RAM failure, you either go there yourself or purchase "hands-on" service from the data center.

3. Scaling Difficulty

To increase capacity, you need to purchase and install new hardware. Instant scaling like cloud is not possible.

4. Remote Management Requirement

You may need to visit the data center for physical access. Remote management tools like IPMI/iDRAC reduce but don't completely eliminate this need.

What to Look for When Choosing a Data Center

Power Infrastructure

Power Redundancy Levels:
N     → Single power source (high risk)
N+1   → Backup power source available
2N    → Fully redundant (double copy of everything)
2N+1  → Fully redundant + extra backup

Ask about UPS (Uninterruptible Power Supply) and generator capacity. How many hours of outage can it withstand?

Cooling System

Servers generate a lot of heat. Insufficient cooling leads to hardware failures and shortened lifespan.

• What is the PUE (Power Usage Effectiveness) value? (1.2-1.5 is good)
• Is the cooling system redundant?
• Is there hot/cold aisle separation?

Physical Security

• 24/7 security personnel
• Biometric access control
• CCTV camera system
• Mantrap entry (double door system)
• Visitor registration system

Network Connectivity

Network Quality Criteria:
- How many different upstream providers? (diversity matters)
- Is BGP peering available?
- Connected to IX (Internet Exchange) points in Turkey?
- What is the bandwidth guarantee?
- Is DDoS protection offered?

Tier Certification

The Uptime Institute's Tier classification shows the reliability of the data center:

REXE Colocation Service

REXE Technology offers colocation services in a TIER 3 certified data center in Istanbul.

REXE Colocation Features:

• TIER 3 certified Istanbul data center
• Redundant power infrastructure (N+1 UPS + generator)
• Advanced cooling system
• 24/7 physical security
• DDoS protection via Path.net
• High-speed network connectivity
• Remote hands service
• 24/7 Turkish technical support

Who Should Use Colocation?

Colocation is ideal for:

• High performance requirements: Virtualization overhead is unacceptable
• Data security priorities: Data must be physically under your control
• Long-term investment: Fixed workload for 3+ years
• Custom hardware: GPU cluster, specialized network equipment
• Compliance requirements: KVKK, banking regulations, healthcare sector regulations
• Existing hardware: You want to utilize servers you already have