Remove host from vcenter


I am upgrading my current ESX 3.5 environment to ESXi 4.1. Both environments have separate vCenters. The 3.5 one has no cluster, only a datacenter where hosts reside. For the upgrade I want to remove the host(s) from the old vCenter and import the host to the new 4.1 vCenter environment, but still use the old vCenter as the license server for the 3.5 hosts until they are ready to be reinstalled to ESXi 4.1. When I was about to remove one of the hosts from the 3.5 vCenter I received a prompt saying "Removing this host will also remove all of its virtual machines and resource pools. Are you sure you want to do this?" Does this actually interrupt or remove any VM's on that host or does this message mean remove so that it is no longer shown in the old vCenter? I found several different topics on this and with a few different answers.

Appreciate the replies.

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Paul SolovyovskySenior IT AdvisorCommented:
From the Vcenter 3.5 install the license server and add the old license key into vCenter 4.1.  If you remove them from vCenter it's ok, they will still run, just that specific vCenter only paramaters such as resource pools will not be kept in the system.  Just recreate on vCenter 4.1 if used

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synackrstAuthor Commented:
Thank you, so basically what you are saying is that you can right-click and click remove on a host without disrupting any VM functionality on that specific host, but  things like statistics and other will be lost from vCenter?
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
You should be okay to remove the ESX 3.5 host from vCenter 2.5, the VMs will continue to function.

As you are using a new vCenter 4.1, history and statistics will be lost, unless you've migrated your old database, or are using the old vCenter database.

Make sure, that you specifiy the License Server in the vCenter 4.1 configuration, so the ESX 3.5 servers can still receive licensing information from your license server on the vCenter 2.5 server.
synackrstAuthor Commented:
Yes, I will keep my old vCenter installation running with license server until all 3.5 hosts are either shut down or reinstalled to 4.1.

Thanks for the replies.
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