steps::
# instance is located on A, B
- $ gnt-instance replace -n %nodeC% %instance1%
+ $ gnt-instance replace-disks -n %nodeC% %instance1%
# instance has moved from (A, B) to (A, C)
# we now flip the primary/secondary nodes
$ gnt-instance migrate %instance1%
# instance lives on (C, A)
# we can then change A to D via:
- $ gnt-instance replace -n %nodeD% %instance1%
+ $ gnt-instance replace-disks -n %nodeD% %instance1%
Which brings it into the final configuration of ``(C, D)``. Note that we
needed to do two replace-disks operation (two copies of the instance