Uninstalling VCenter with managed hosts?

HI,

I have vcenter 5.5 installed, but it's crashed and won't start.  I want to do a reinstall as advised by our support.  This is basically to give us a fresh database.

But I have a question I'd like a second opinion on: If I uninstall the vcenter even though we have a couple of hosts attached to it (in a cluster) will we run into issues?

Thanks
ts11Asked:
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Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization ConsultantCommented:
None whatsoever.

Clearly DRS will not function or vMotion.

Running VMs will no be affected, if you have configured VMware HA, this will continue to function, because VMware vSphere vCenter Server, is only used to deploy agents, and configure the HA agents, on the host servers.

So you are fine to uninstall. To make it easier, Remove the Hosts from vCenter Server before uninstalling vCenter Server from Windows.

You could also consider the vCenter Server Appliance.

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ts11Author Commented:
Thanks.  The current installation is very basic, just vcenter with update manager and two hosts.

I would like to remove the hosts before uninstalling, but vcenter crashed and won't start, as per my OP.

Good to know it won't be an issue.  Thanks.
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization ConsultantCommented:
Connect to each host with vSphere Client and dissociate them from vCenter Server.
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ts11Author Commented:
I wasn't aware that was possible to do in the vsphere client connecting directly to a single host? My hosts are running 4.1 if that makes a difference.

If I read your early post right, it will be fine to just do a straight uninstall?
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization ConsultantCommented:
Yes, fine to complete an uninstall.

Yes you can connect directly to any ESX/ESXi server with the vSphere Client.
ts11Author Commented:
Ok, thanks.

Sorry, my question wasn't clear.  I meant to say "I wasn't aware it was possible disassociate a host from vcenter by connecting to the host directly?" Is there an option in vsphere client to do that?
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization ConsultantCommented:
Yes, connect directly to the ESXi host using the vSphere Client.

On the Summary Page (first page), Bottom Right, there is a link

Disassociate Host from vCenter Server - click it,
ts11Author Commented:
The Host Management part? Only has the option to reconnect - does this mean it's already done it? I've attached the screenshot.
hostvsphere.PNG
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization ConsultantCommented:
Yes, it does.

It could be your server has failed, and it's no longer commuincating with the ESXi host.

Hence it's in a disconnected state.

It would normally show, if connected...

Disassociate host from vCenter Server1.jpg
Disassociate host from vCenter Server
ts11Author Commented:
Yes, the vcenter service itself crashed which is why I need to reinstall it.  Happy that our hosts won't be affected by this.  Will do this tomorrow then close the thread once complete :)
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization ConsultantCommented:
No problems
ts11Author Commented:
Just got prompted with this as the install was about to complete.  I'm using a fresh db, so I assume its ok to proceed without affecting any other operations?
vcenterinv.png
ts11Author Commented:
went ahead with it and it's fine.  thanks.
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization ConsultantCommented:
No problems.
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