Sorry I didn't catch this previously, the OM Essentials is monitoring software that  gets info from OMSA to provide server information across multiple systems.With Open Manage Essentials you can look at the details of multiple servers in just the one interface. With OMSA you can manage the server specifically.  In order to have mgmt controls for the server you will need to use Open Manage Server Admin. 
I was wondering how one can add a drive into an existing RAID array   while ESXi is still running. I have read that you are able to use Dell   OpenManage to do this. I have installed OMSA 7.0 on the VMWare ESXi  host  (5.0 and fully updated) and I've installed OpenManage Essentials  on a  Windows Server 2008 R2 guest. The issue that I'm having is that   OpenManage is unable to see my RAID controller. I have seen videos and   photos as parts of guides on how to do this online, so I would assume   that the functionality exists and I just have it set up wrong.
Remote RAID Control in ESXi on a Dell PowerEdge 2950 Using OpenManage