If we're naming racks to be serviceable, seems easier to have numeric rows, dash, alphanumeric cabinets, dash, numeric racks. 3-K-7 seems extremely better than disney-snowwhite-dopey. And your labels should hold the breadcrumb: [3] (row), [3-K] (cabinet), [3-K-7] (rack). The other benefit is not having to guess where these things are (or having to dictate this very same information to land someone near "dopey").