I too have built out several racks of SuperMicro twins. I'm never buying another SuperMicro, for many reasons. The amount of cabling for properly redundant con

I too have built out several racks of SuperMicro twins. I'm never buying another SuperMicro, for many reasons. The amount of cabling for properly redundant connections is a killer; it's at least three cables per system (five in our case); a rack will have hundreds of wires to manage. Access to the blade is in the back, where the cables are, and you have to think ahead and route things cleverly if you want be able to remove blades later. The comment about doing something other than three 48-port switches is bang on. And if you're running Juniper hardware, avoid the temptation to make a Virtual Chassis (because it becomes a single point of failure, honest, and you will hate yourself when you have to do a firmware upgrade). 19KW is still a ton of power, and I'm surprised the datacenter isn't worried (none of the datacenters we use worldwide go much above 16KW usable). Also, you need to make sure you're on redundant circuits, and that things still work one of the power legs totally off. Make sure you know what kind of PDU you need (two-phase or three-phase), and that you load the phases equally.