Questions about connecting to a host ESX 3.5 to vCenter 4.1

I need to migrate 7 hosts 3.5.x ESX ESX 4.1. I did not have a test environment and will work with live on committed production systems (not clustered). vCenter 4.1 and two new 4.1 ESX hosts have been configured to handle live Vmotion (cluster will come later). I activated the license point server towards the old VirtualCenter 2.5 in the hope of being able to disconnect a host ESX 3.5 live the old virtualcenter and reconnect to the new vCenter 4.1 without rebooting the host ESX 3.5. VUM is not an option at the present time, so I intend to do a full install base upgrade.

(1) I know that I can disconnect the ESX 3.5 server the old virtualcenter without problem. My first question is, if I try to join the new vCenter (config pointing to the old license server) box of 3.5 will be vCenter 4.1 need to install the new management agent in the box of 3.5 and therefore require the host restarts?

(2) if the agent of 4.1 management is not installed on the host ESX 3.5, its virtual machines can be migrated (cold) to one of the new servers?

I should add that the licenses are not a problem, we are migrating to the latest keys but have sufficient old licenses to manage the transition. The VMs are on SAN LUNs that are visible to guests old and new.

Especially, I want to know what to expect through are exactly what will to restart is required and have not been able to locate that particular point.

Thanks in advance.

hensonj7

When we went from 3.5 to vSphere, is that big of a deal.  Just disconnected the vCenter server host and updated the vCenter keeping the existing license server, and then re-attached to the new Victoria Cross.  It will establish links with the new 4.1 software, but it shouldn't require a reboot at all.  I did mine with all virtual machines out of it, but I think you can do all this live... Since a little while I did this upgrade

-Kyle

«"RParker wrote: I guess I was mistaken, everything CAN be virtualized"»

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