An online retailer must process payment-card data that falls under PCI-DSS rules. Security policy says the compute environment must run behind the company's firewall and no other organization may share the physical hosts that store or process the data. At the same time, business units want to provision virtual machines on demand through a self-service portal and receive charge-back reports for the resources they consume. Which cloud deployment model best satisfies all of these requirements?
A community cloud run by a provider for multiple organizations that need PCI compliance
A dedicated private cloud built and operated inside the company's own data center
A hybrid cloud that bursts excess workloads to a public cloud during peak demand
A public IaaS deployment that uses a virtual private cloud (VPC) and network segmentation
A private cloud gives a single organization exclusive access to the underlying compute, storage and network resources, whether the hardware is on-premises or hosted by a third party. Because the infrastructure is not shared with other tenants, it is easier to meet strict compliance frameworks such as PCI-DSS. When it is implemented with virtualization and automation, a private cloud can also expose self-service provisioning and measured (charge-back/show-back) usage-capabilities that an ordinary on-premises data center might lack.
A public IaaS offering that relies on virtual private clouds is still multitenant at the physical layer, so it does not guarantee that no other customer's workload will run on the same host. A community cloud is designed for several organizations with similar needs and therefore also violates the "single-tenant" requirement. A hybrid cloud that bursts to a public provider loses the physical isolation the policy demands whenever traffic moves to the public side, making it unsuitable for strictly regulated card-holder data.
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