[weblacky]

Sounds like an OPTION partitioned disk instead of a ROOT partitioned disk. When you ran FX, did you properly tell the system it was a booting root (/) drive by doing: select [R]epartition > [RO]OT > Confirm XFS. Then Write disk label?

A huge /usr volume is an usually the default when creating an option disk because /usr/people is for home directories. So it's often the second-most common need for extra space. It's what you do for "additional" single hard drives after the first (root partitioned) drive to allocation more space to for home directories or other non-root mount points.

Did you follow a guide like: http://www.sgidepot.co.uk/6.5inst.html