What you can do more easily ....
mkvdev on VIO the first LUN
cfgmgr on the LPAR -> hdiskx
mkvdev on vio the second LUN
cfgmgr on the LPAR -> hdiskx+1
etc. etc. etc.
its a bit more work but in the end you got the disks like you want to
Dont forget to delete the disks on the LPAR before you begin as it numbers new disks from the last it detected (lsdev |grep hd) to see you disks |