You're guessing. Kirk was hoping for something slightly more definitive
than that. To begin with, 7.1TR8 not 7.1TR7.
Guest of a guest?
I have vios.
vios is guesting fiber tape controller to four lpars of IBM i
vios is also guesting ethernet to four lpars of IBM i
One of those lpars of IBM i is also guesting the disk for the other three
lpars of IBM i.
Back to Kirk,
IBM does not support 6.1.1 as an lpar, guested or otherwise on Power 8.
Even if you were able to get it running good luck on trying to get ANY
call helped by IBM.