All NVMe seems like a good starting point, but I'd hope that some day there will be a more capacity-oriented variant for people who actually know what they're doing with exabyte-scale storage.
Nothing any more, but I used to work on such systems at Facebook. The public name was Tectonic; there was a paper at FAST this year IIRC. As time goes by, this kind of scale is going to be more common. I still remember when having a single petabyte was something to brag about.
