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Sofia, Bulgaria
Tier III design, running since 2018: three halls with 15,000+ U of equipment, two independent substations, N+1 generators and cooling, and our own engineers on site 24/7.
The facility
Real photo of our own servers and data center, not AI-generated.
Built in 2018 and run by us: the power, the cooling, the security and the people on the floor are ours to answer for. Carrier-neutral, with all the local telecom operators present and our own DWDM ring to other data centers in Sofia.
| Standard | Tier III design |
|---|---|
| In service | Since 2018 |
| Halls | 3 colocation halls |
| Equipment | 15,000+ U running |
| Carrier-neutral | Yes |
| Location | 4.5 km from the airport |
| Mains | 2 independent substations |
|---|---|
| Transformers | 2 x 2500 kVA |
| Generators | 1000 kVA diesel, N+1 |
| UPS | Modular, redundant |
| Feeds | A and B, separate panels |
| Units | High-efficiency cooling, N+1 |
|---|---|
| Layout | Hot and cold aisles |
| Density | Up to 24 kW per rack |
| Efficiency | Free and adiabatic cooling |
| Climate | About 21 °C, 50% RH |
| Cabinets | 48U, 1070 x 600 mm |
|---|---|
| Doors | 90% perforated |
| Power | Up to 4 x 32 A |
| Metering | Individual, online |
| Supplied | Zero-U PDUs, cable managers |
| Raised floor | 50 cm, 1,200 kg/m² |
| Private space | Cages and halls |
| Cable entries | 3 separate |
|---|---|
| Cable routes | 3 independent |
| Operators | All local operators |
| Other DCs | Our own DWDM ring |
| Cross-connects | Fibre, copper or coax |
| Wireless | Radio links possible |
| Our network | 10 carriers, 25+ exchanges |
| Guards | Perimeter, 24/7 |
|---|---|
| Cameras | Halls and building |
| Entry | NFC cards |
| Cabinets | Individual locks |
| Fire | Smoke and fire alarm |
| Customers | Authorised, 24/7 |
| Deliveries | Freight entrance, parking |
Most hosting companies with many locations rent colocation: racks in a building run by another company, with that company's staff on the floor. We run ours.
| Topic | Rented colocation | Our own data center |
|---|---|---|
| Who is on the floor | The landlord's staff or a remote-hands contractor, working one queue for every tenant. | Our own hardware engineers, and nobody else's. |
| A failed part | A ticket to the building, a part ordered and shipped, then another ticket to fit it. | Taken from our own warehouse on site and fitted by the engineer on shift. |
| Nights and weekends | Remote hands on call, often billed per visit and rarely quick. | Engineers in the building 24 hours a day, every day. |
| Custom builds | Parts bought for your order, then shipped to a site the provider rarely sees. | Built from our own stock, in the building where the server will run. |
| Changes | Power, cabling and access go through the landlord. | Decided by us and done by us. |
Real photo of our own servers and data center, not AI-generated.
On site
There is no data center staff and no remote-hands contractor in the path. The people on the floor are our own hardware engineers, every hour of every day, and they work on our servers and our customers' hardware only.
The warehouse
We keep drives, memory, processors, power supplies, network cards and complete servers in stock, in the same building. That is what makes a custom configuration quick to build and a failed part quick to replace.
The hardware
Every server is a Dell PowerEdge or an HPE ProLiant. We do not build machines from desktop parts, and there are no towers or desktop cases in our racks. Fewer models means better spares and engineers who know each one.
The same failure, at a typical hosting company that rents its space in someone else's data center, and here.
A typical hosting company
Days
LAN-SERVERS
The same night
Certified and audited
Cloud Wall Ltd is certified for quality management and information security, compliant with PCI-DSS for card-handling environments, and operates within the European security and incident-reporting framework that applies to digital infrastructure providers under NIS2. GDPR applies to us both as a controller, for the account and billing records we keep ourselves, and as a processor for whatever runs on your server, and it is designed into what we retain.
A server of ours in this building, ready in 2 hours from stock, or rack space for your own hardware. Either way our engineers are on the floor around the clock.