The Case Against Private Clouds

Over the past few weeks, I've examined the role of private clouds in cloud computing. In posts one and two, I discussed the functional services that comprise a private cloud, both from the infrastructure as well as the application management perspective. Last week, I discussed the case for private clouds -- why they are the most likely way mainstream IT organizations will implement cloud computing.

This week, I want to take the contrary position -- why private clouds are not the future of cloud computing, and, in fact, will prove too daunting for IT organizations.

First, one of the main reasons posited for private clouds is that they enable IT organizations to repurpose existing infrastructure. But is that really true? The key to automating the bottom half of the chart -- the infrastructure portion -- is to use equipment that can be configured remotely with automated measures. In other words, the equipment must be capable of exposing an API that an automated configuration system can interact with. This kind of functionality is the hallmark of up-to-date equipment. Unfortunately, most data centers are full of equipment that does not have this functionality; instead they have a mishmosh of equipment of various vintages, much of which requires manual configuration. In other words, automating much of the existing infrastructure is a non-starter.

Worse, even if the data center equipment is mostly of recent vintage, additional investment will be necessary. Add-on equipment to manage networking and storage will be required for cloud capability. Absent sufficient investment to ensure every part of the kit is automation-ready, the goal of end-to-end automation that is cloud computing will fall short. That is to say, more capital investment is going to be required to get to the Nirvana of a private cloud. And in these economic times, where IT is slashing budgets, an initiative that calls for more investment is not really practicable.

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