Hello,   There's no reconfiguration requirement to re-install MEM after the upgrade.  It will layer over the existing configuration as before.   My personal preference is to uninstall 3rd party applications before upgrading to make the upgrade process cleaner.  I don't know of any problems upgrading to 1.1.2 then upgrading ESX, I've not tried it personally. 
Hi All, I'm preparing to upgrade our Dell R610 Hosts from ESXi4.1 U1 to ESXi 5.1.  We are using an EqualLogic PS6100E via iSCSI.  I have vCenter 5.1 installed and have prepared Update Manager with the Dell Custom ESXi 5.1 image, thinking that it would contain all necessary drivers/modules.  However, after scanning my ESXi Hosts I receive the following Warning (see attachment).  Has anyone performed an upgrade from 4.1 to 5.1 in a Dell environment with EqualLogic?  I'm not warm and fuzzy about proceeding considering the Warning.  Thanks! [IMAGE]
Upgrading ESXi 4.1 to 5.1 in a Dell EqualLogic environment?