Is upgrading from ESXi 3.5 to 4.1 possible or do I have to hit 4 first?

Just wondering if I am supposed to update to 4 first.  I have googled around and got conflicting answers.
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cjameson74Asked:
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willettmeisterConnect With a Mentor Commented:
I would recommend a clean install and not an upgrade.  
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lnkevinConnect With a Mentor Commented:
Upgrade is a mess since it will overwrite the kernel anyway. Re-install should be a proper way to move from version to other version.

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simonseztechConnect With a Mentor Commented:
Hello,First be sure that your hardware is on the Hardware Compatiblity List for 4.1http://www.vmware.com/resources/compatibility/search.phpIf the ESX 3.x host has network access, you can use the vSphere Host Update Utility to perform the upgrade.  vCenter Update Manager is available with vCenter Server 4.0, vCenter Server 4.0 Update 1, vCenter Server 4.0 Update 2, and vCenter Server 4.1. Is available on the vSphere download site: www.vmware.com/download/vsphere.You can perform an "offline" update following this guidehttp://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009440Please advise that this currently experimental support.Since you are upgrading please consider upgrading to ESXi 4.1, because ESX 4.1 is the lastest build of the ESX line. From now on VMware will only support and update ESXi.The official upgrade guide is at: http://www.vmware.com/pdf/vsphere4/r41/vsp_41_upgrade_guide.pdf and all of the other docs including an HTML based library at: http://www.vmware.com/support/pubs/vs_pages/vsp_pubs_esx41_vc41.htmlhttp://ituda.com/vmware-35-upgrade-to-vsphere-video/Hope it helpfrom previous similar question: http://www.experts-exchange.com/Software/VMWare/Q_26478384.html
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lnkevinConnect With a Mentor Commented:
Do not update, you will be running in some API error issues with some component especially qlogic drivers... you just install ESXi 4.5 (re-install the OS). If you currently have some vm's on it, make sure you enable the option keep all vm....

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Matthew EnglandTechnology ConsultantCommented:
Looks like you've got some pretty good answers already posted, but I figured since I ran in to the same situation I'd comment. ESXi 3.5 will not upgrade to 4.0 or higher. Starting at ESXi 4.0, the vSphere Host Update Utility will patch and upgrade your hosts, but 3.5 to 4.0+ will require a clean install.
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Paul SolovyovskySenior IT AdvisorCommented:
You have some good answers so far.  Keep in mind, vCenter 4.1 (if you're using it) requries a 64 bit OS so you can't upgrade vCenter 2.5 to 4.1 unless you're running on 64 bit OS for it.

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cjameson74Author Commented:
I got enough answers here to base my decision
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