Christopher (Drashna), can I ask non-usual (in this thread) question?
But first of all sorry for not very good English, it's not my native language.
131TB of storage are very LOT of data (even if it not all 131TB full of data)), how you organize it logically? To prevent data loss and etc.
For example, Microsoft storage spaces looks good for this ( efficient space use, different raid-like types of volumes, etc), but still have "one entry point" - in case of storage pool fail, all data, no matter simple, parity, or mirror volume will fail. And in my practice such pool fails was take place.
DrivePool - good, but not in all cases (no support for VSS, other limitation).
Also backup - how to backup such amount data? CrashPlan or BackBlaze can, but restore will be very slow, often need to restore ASAP.
So, if it's not secret (or keep deeply secrets but tell basic info:)) question is - how you organize storage logically on storage server? What software use to backup, mirror-raid, etc.