Problems have been encountered with older versions of DKMS on EL6, and later Fedora versions, as reported on the CentOS fora and Bugzilla. https://www.centos.org/modules/newbb/viewtopic.php?topic_id=32871 https://bugzilla.redhat.com/show_bug.cgi?id=702483 Dell has 2.2.0.2 available. http://linux.dell.com/dkms