128TB filesystem limit?

[Peter Grandi]

> I'm working with a raid 0 (md) array on top of 10 16x1TB raid
> 6 hardware arrays.  fdisk -l shows me 10 drives like [ ... ] I
> then did mkfs.xfs /dev/md0 but a df is showing me 128TB [ ... ]

A 128Tb single filesystem ontop a 160 drives RAID60! Even
better, one made of 10x 14+2 RAID6 components.

It shows a dedication to "if it is possible it must make sense"
logic and an admirable faith in luck.

Perhaps a small discrepancy in size units is not the most
interesting aspect of this query.