Glossary

Private cloud

A private cloud is dedicated infrastructure controlled by one organization and run with the self-service and pooled resources of a public cloud. The operating model, not the hardware, is what makes it a cloud. Without self-service and metering, it is a data center under a new name.

Which two tests separate a private cloud from a renamed data center?

The first test is how capacity is obtained. If people still file a ticket and wait for an administrator to allocate storage or compute, it is not a private cloud. In one, requests go through a portal or API, and automation provisions the capacity from a shared pool with no person in the path. The second test is metering. Usage is recorded per tenant and charged back or shown back, so consumption has a visible cost to the team that causes it.

How does the model work inside?

Resources from many servers are combined into a pool, as described under storage pooling. Each department or customer is a tenant with its own quotas, access rules and encryption keys, a design covered by multi-tenant storage, so one tenant cannot read or exhaust another's share. Provisioning is driven by code and templates, which is the territory of cloud automation. Capacity grows by adding standard servers to the pool, a pattern known as scale-out storage.

Why does capacity planning get harder than in a public cloud?

A public cloud hides the supply side: capacity appears when requested. In a private cloud the organization owns the supply, and hardware takes weeks or months to arrive after it is ordered. Self-service removes the human delay, which means demand can now appear faster than servers can be delivered. The mechanism is a headroom buffer above the demand line, bought ahead of need. Teams that skip it become the bottleneck they were meant to replace, with self-service requests failing because the pool is full.

Why do organizations build one?

Three drivers recur. Data sovereignty keeps data in a specific country, facility or operator's control. Egress costs make it expensive to leave a public cloud with heavy data, so some organizations bring that data home; the cost mechanics are in egress fees. And AI workloads work best with compute next to the data they train on or retrieve from. A private cloud is also the owned half of many hybrid cloud designs, where it holds the steady, sensitive workloads and a public cloud takes bursts.

Frequently asked questions

Is a virtualized data center a private cloud?

Not by itself. Virtualization pools hardware, but without self-service provisioning and usage metering it still runs on requests to administrators.

Can a private cloud be hosted by a third party?

Yes. What matters is that the infrastructure is dedicated to one organization and controlled by it, not whose building it sits in.

How does a private cloud handle storage?

Usually with an S3-compatible object layer for unstructured data, plus block and file services, all drawn from the same pool and metered per tenant.