CentOS 7 - xfs shrink & expand

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I'm having some difficulty finding a method to shrink my /home to expand my /.  They both correspond to LVMs.  It is my understanding that one cannot shrink a xfs filesystem.  One must back it up (xfsdump), remove (lvremove) redefine it and then restore it back (xfsrestore).

Okay, I'm running into a problem where /home  needs to be "unused".  If tried going in to "maintance mode", but I ran into a problem with the mount command (after issuing a 'chroot /sysroot').  I then tried using SystemRescueCD to boot to, but it wouldn't mount my 32TB RAID USB drive (something about too big).

Any thoughts or suggestions?

-Frank

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