Description of problem: The "system-config-cluster" tool can't save its configuration data into /etc/cluster/cluster.conf file due to the non-existence of /etc/cluster directory during initial installations. This directory should be either auto-created by rpm install and/or system-config-cluster should be able to handle the empty directory scenario.
I addressed this issue about 15 revisions ago :) It is taken care of in the 1.0.12-1.0 build
*** This bug has been marked as a duplicate of 158230 ***