Since the early days of cloud, IT has struggled with the limits of even the best public cloud. The model that offered agility, just-in-time provisioning, and minimal CapEx, came with downsides like multi-tenancy, limited resilience, and loss of control.

Some organizations circled the wagons around another model; private cloud. Private cloud offered the potential of public cloud-like services with the ability to fully control underlying hardware, cloud software, performance, and resilience. This legacy private cloud had the promise of letting them create a cloud without rearchitecting security requirements. It let them leverage existing hardware. It offered a fairly straightforward transition from virtualization.

But there were downsides.

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