[CentOS] Can anyone talk infrastructure with me?

a major stumbling block is that the disk drive industry still hasn't 
recovererd fully from the Thai floods, and 3tB nearline server grade 
drives are on allocation and demanding high prices.  you might find you 
can't just order 1000 of these from Newegg or whatever, they don't have 
them.    using 2TB drives, and you'd need 1500, whcih means another rack 
and that much more power and HVAC