Listing 3.
To expand the filesystem without unmounting it, set
up a second RAID 10 array, add it to the volume
group and then increase the filesystem.

# after setting up a RAID 10 for the second shelf
# as /dev/md5, add it to the volume group
vgextend ben /dev/md5
vgdisplay ben | grep -i 'free.*PE'

# grow the logical volume and then the jfs
lvextend --extents +88349 /dev/ben/franklin
mount -o remount,resize /bf