Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

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.


share|improve this question

None of this sounds too much trouble.

Firstly update your VC, go straight to 4U1, not via 4.0 ok - just use the regular upgrade path, backup your system first though of course. Oh and there's no problem having VC4 managing v3.5 and v4 hosts, you won't be able to lose your license server until you get rid of your last v3.5 box though of course.

Personally I'd wipe and rebuild your ESX boxes unless you have a particularly complex network setup. I might be tempted to disconnect your servers from the SAN during the rebuild by the way.

Oh and your DS is supported (Clicky)

Best of luck.

share|improve this answer

As Chopper's told you, I think the better way is a complete re-installation, I guess you had clustered your installation? So, if you correctly set your servers, one missing during the operations will be automatically replace by another one on the cluster.

In my corporate, we have replace all our VMWare ESX VI3.5 by a VSphere 4.0 with this way.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.