Planning is required, and early adopters say that heating, cooling and space allocation are issues around which to be especially careful.
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Blade Servers
Your article addresses the high density that blade servers can provide but it does not mention the ROI. We looked at blade technology and found that the ROI just wasn't there. Plus once to deploy a base chassis you are locked into buying from single manufacture until a given blade system is completely full. This will hinder your bargaining power with the various system vendors.
You do mention cooling but not the added cost and complexity that high density cooling brings. Traditional cooling will work up to approximately 7KW per rack. Once you pass this point you need to look at more exotic methods of providing cooling. These systems are not cheap and they bring added redundancy and failure issues. But most importantly they are only required for high density computing. If you keep your consumption at 5-7KW per rack you will not need to add any high density cooling.