Where Are My Yobibytes?

This post says:

I just learned that in a Scale Out File Services (SOFS) solution a customer can implement a global filesystem (with clustering/replication) that has a maximum filesystem capacity of 33554432 Yobibytes.

I can't find the original reference to those yummy yobibytes (1024 zebibytes, in case you were wondering), but I have no reason to think they're not there, somewhere, it's just a question of searching....