I am planning to upgrade our VI3 infrastructure to VSphere 4. The VI3 consists of the following: esx servers 3.5 U2 running on Dell PE1955 blades with Intel Xeon Quad core E5335 CPUs Virtual Centre 2.5 running on Windows Server 2003 as a VM The VC database is running on SQL server 2005 SP2 and a size of 3GB No Update Manager running at the moment on VC2.5. The license server is running on a separate Windows box. I have enough upgrade license keys for VSphere 4. Total of 8 ESX servers in VI3 at the moment but only 5 will be upgraded to ESX 4.0. Would it be possible to run remaining 3 esx servers in the VC4.0? What would be the best way to upgrade the VC 2.5 to VC 4.0? What would be the best way to upgrade ESX server 3.5U2 to ESX4.0, Clean install or Update Manager?
Are there any issues upgrading VC2.5 to VC4.0 Update1?
The VMs are stored on datastores mounted on IBM FC SAN DS4500. Is this SAN compatible with vSphere4.0?
Is there anything else I need to consider in this upgrade process?
I need to confirm this information before I start the upgrade process and your input will be highly appreciated.