Hi, The C6145 does not have a validated version of OMSA for it. You could try the LSI megaCLI tool, but it is not validated and may have the same issue.   
I'm running Ubuntu 14.04, 64bit, on a C6145. I installed srvadmin-all 7.4 via the directions at linux.dell.com/repo/community/ubuntu/. It installed successfully. However, when I run "/opt/dell/srvadmin/sbin/omreport storage pdisk controller=0", I get "No controllers found." Does anyone know how to fix this on Ubuntu 14.04?
C6145, Ubuntu: omreport no controllers found