Hi, We have a cluster with CentOS 5.5 installed with oscar. The firm which has pre-installed the cluster has done strange things...and now I get problems: - if I understand correctly what was done, several infiniband CentOS packages were installed (compat-dapl, compat-dapl-devel, compat-dapl-utils, libibcm, libibverb, librdmacm, mpi-selector). - Then the tar package from OFED was installed. This archive contains rpm packages too...and were installed. - So on our nodes we have several versions of "compat-dapl, compat-dapl-devel, compat-dapl-utils, libibcm, libibverb, librdmacm, mpi-selector". I would like to remove the package from CentOS (in order to have homogen OFED environment). How can I do that ? These packages target the sames files...If I remove the package of CentOS, will it erase all the files in common ? how does rpm/yum behave in this situation ? Best regards, Guillaume