The Search team is budged to buy three boxes for scaling up WDQS. We're going to get them three special-purpose cloudvirts (cloudvirt-wdqs100[1..3] and put one big VM on each one.
Their requested specs are:
8 cores 128G RAM 3T usable SSD storage after raid10 1G NIC
Running these as virt hosts will require a tiny bit of overhead, so I'm going to say our minimum specs are actually:
9 cores 132G RAM 3.1T usable SSD storage after raid10 1G NIC
We don't need to hit that on the button, though -- I'm hoping that there's a standard build that comes close and we can convince search to live with it if it's slightly smaller.