So if something breaks on a server, like a PSU unit, or a HDD, would you need to shut down the entire server, drain the liquid (or raise the server), and then swap out affected parts?
Would that not be very unpractical?
http://www.youtube.com/watch?v=EZmm7P1mPZs
no need to shut down the server. you pull it out and swap the parts (for front-accessible hotswap HDDs you won't even have to pull it out). cabling is designed to accommodate that.
i can imagine, though, that "pulling out" a 4U storage box fully loaded with hdds may become a bit strenuous.
I think they need to build a simple pulley or hydraulic lift system for these.