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Moving existing Host into new Cluster

Quick question....I have found info on migrating a host from one cluster to another, but not moving an existing host into a cluster. Here is my setup....

Client has a new Vmware setup that includes 2 Hosts running ESXi 4.1 and managed through VCenter. Until now they have just been seperate hosts.

Host A has been in production a couple months and has about 5 server VMs on it and a Linked Pool clone for desktops. Host B was just recently setup and only consists of an ESXi 4.1 server with a Datastore connected. They are on the same subnet connected through fiber.

I have created a cluster for HA (not DRS) and just want to move both hosts into it. When I go to drag and drop Host A comes up with a warning saying "...it will collapse resourse pools..." which does not sound good. Host B moved just fine.

Host A stores the VCenter server. So I am trying to figure out what the "collapse" actually means and the best method to move a host into the cluster that is in use.
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Appnet
Asked:
Appnet
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2 Solutions
 
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Drag and Drop the host into the Cluster.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Do you have any Resource Pools Defined?

when moving the host into the cluster do you not get a Wizard as follows:-

 Adding-to-Cluster.jpg
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Do you have any resource pools defined on host server or cluster?

If you do they will be "collapsed" or removed.

from the docs...

VMware vSphere Availability Guide ESX 4.1vSphere
http://www.vmware.com/pdf/vsphere4/r41/vsp_41_availability.pdf

When a new host is added to a cluster

• The resources for that host immediately becomes available to the cluster for use in the
cluster's root resource pool.

• Unless the cluster is also enabled for DRS, all resource pools are collapsed into the cluster's
top-level (invisible) resource pool.

• Any capacity on the host beyond what is required or guaranteed for each running virtual
machine becomes available as spare capacity in the cluster pool. This spare capacity can
be used for starting virtual machines on other hosts in case of a host failure.

More Reading Material, very good.....

VMware vSphere 4.1 HA and DRS Technical deepdive (Volume 1)
By Duncan Epping and Frank Denneman
(http://www.yellow-bricks.com/vmware-high-availability-deepdiv/)

ISBN-10: 1456301446
ISBN-13: 978-1456301446

Written by Duncan Epping and Frank Denneman, both of whom are Consulting Architects at VMware and are perceived by the industry as Subject Matter experts on VMware High Availability and VMware Distributed Resource Scheduler.
This book zooms in on two key components of every VMware based infrastructure. It covers the basic steps needed to create a VMware HA and DRS cluster, and goes on to explain the concepts and mechanisms behind HA and DRS which will enable you to make well educated decisions. You will get the tools to understand and implement e.g. HA admission control policies, DRS resource pools and resource allocation settings and more.

On Amazon US

[Paperback]
http://www.amazon.com/gp/product/1456301446?ie=UTF8&tag=yellowbricks20&linkCode=as2&camp=1789&creative=9325&creativeASIN=1456301446

[ebook]
http://www.amazon.com/dp/B004V49JGW/ref=as_li_tf_til?tag=yellowbricks20&camp=0&creative=0&linkCode=as1&creativeASIN=B004V49JGW&adid=0ED4RKK85G6ZTGTH9ENP

on Amazon UK

[Paperback]
http://www.amazon.co.uk/Vmware-Vsphere-4-1-Technical-Deepdive/dp/1456301446/ref=sr_1_2ie=UTF8&s=books&qid=1305637596&sr=8-2

[ebook]
http://www.amazon.co.uk/VMware-vSphere-4-1-technical-deepdive/dp/B004V49JGW/ref=sr_1_1?ie=UTF8&s=digitaltext&qid=1305637596&sr=8-1

Available in Europe from
http://www.comcol.nl/detail/73133.htm

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AppnetAuthor Commented:
There is one defined resource pool. So it will be deleted and need yo be recreated?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Yes, is this on the server or cluster?
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AppnetAuthor Commented:
The pool is under Host A which is the one I still need to move
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AppnetAuthor Commented:
Now that resource pool is associated w a linked pool....does that change anything?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
The Linked Clone Resource Pool you have defined on the Host Server will be removed, when moved into the Cluster Resource.

You will need to recreate it.
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VenthoughtCommented:
Hi Andrew and Appnet,

I'd like to comment on this as I have the same situation but in my case I don't have resource pool configured in the datacenter.

I just need to verify a couple of things:

1. I created a new cluster under the same datacenter and I will enable HA to this new cluster. Should I have to enable HA first or do I have to move the host first before enabling HA?

2. Moving the hosts to the new cluster - would it affect the active VMs? Is there a need to migrate all the VMs to the other hosts first before moving the host? and then move them back to the host, this time to the new cluster. And is it simple as drag-and-drop? or do I have to disconnect, remove and add the host to the new cluster?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
@Venthought - Please post a new question, and myself or other Experts will be glad to assist.
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