Big filesystem > (4TiB) recommendations (mkfs parameter tuning?)

[Justin Piszcz]

Often, on this list, there are issues where there is not enough memory, 
etc, to repair a large filesystem.

If one is going to create a 10-16TiB filesystem (for example), should one 
use the mkfs.xfs defaults, or should there be special tuning for 
filesystems of this size, so they will be less susceptible to failure for 
one reason or another?

Justin.