VMware 5.1 cluster reduction and logistics

Hi all,
I think I have a logistics question more than anything else. I have a IBM blade chassis with 10 blades attached to a huge iscsi San. All 10 blades form part of a esxi 5.1 cluster. The current system is very much under utilised with CPU per host below 1%. The reason - a project to deploy new systems was never implemented and so we have this huge resource very much under utilised. Here's first question - I have created additional LUNs on the storage and want to V2V systems from another 5.0 cluster that is maxed-out. Question-can esxi hosts be part of more than one vsphere cluster? Last question, if the answer is no to the first question and I want to start taking hosts from the first cluster to re-use for the V2V's what is the best way to do this? Would I vmotion the guests to the other hosts to free them up and how do I remove them from the original cluster? And what is best to do to monitor the original cluster as I start taking hosts from it to ensure it doesn't become over utilised. Many thanks
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Jason ThomasAsked:
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GG VPCommented:
Hi  JasonHels,

Are the clusters placed under same datacenter?
Are the clusters managed by single Vcenter?
Does the Esxi hosts from both the clusters have access to your iscsi datastore?


Question-can esxi hosts be part of more than one vsphere cluster?
No

Please go through the below link and you are welcome to ask your queries!

http://vmwaremine.com/2012/10/21/vmotion-vm-between-vsphere-clusters/


Thank you!
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Hosts cannot be part of another Cluster, or managed by another vCenter Server (if they are already managed).

But you can safely V2V using converter from them.

vMotion may be an option for you as vMotion is just based on TCP/IP communications, so if the hosts can communicate between VMKernels portgroups, vMotion is possible - IF managed by the same vCenter Server.

You could just temporary remove a host from the other vCenter, and then do the move, and add back...

see my EE Articles

HOW TO: FAQ VMware P2V Troubleshooting

HOW TO:  P2V, V2V for FREE - VMware vCenter Converter Standalone 5.5
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Jason ThomasAuthor Commented:
Thanks Andrew. So I am proposing on removing 3 hosts from the cluster to form a second cluster for the VMs that I will migrate to a new data store that I have configured.
The 3 hosts all currently host 5 VMs as part of the cluster so how do I remove them ensuring the virtual machines are managed by the other hosts that will remain?
Thanks
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Jason ThomasAuthor Commented:
Hi GG VP

Are the clusters placed under same datacenter? No - same storage chassis but different data store.
 Are the clusters managed by single Vcenter? Hadn't really thought about it, but the one vSphere can manage more than one cluster then?
 Does the Esxi hosts from both the clusters have access to your iscsi datastore? Yes.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
The VMs will not be affected by any changes to the Host. (provided you do not remove the VM datastore).
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GG VPCommented:
Disconnect the ESXi host from old cluster and connect to the new cluster.

Hope you have common network. Once in the new cluster, vmotion the VM's and once all the VMs moved you can drop the host and add it back to the old  cluster
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Jason ThomasAuthor Commented:
So right-click host name won't cause any issues? Or should I say that any VMs that the host is servicing will auto vMotion to the other hosts in the cluster?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
You will need to Migrate them.

Also make sure if the VMs are powered on, the processor types are the same.
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Jason ThomasAuthor Commented:
Sorry for responding so late. Back from hols with one final question. so I have 10 blades all managed by one cluster. In order for me to free up 5 blades (performance outstanding) the process is this.
1. Access each host via the vsphere console and identify the current VMs on the host.
2. Migrate each VM to one of the remaining 5 hosts.
3. Now that I have 5 free hosts I can create another data store that is on the same storage and have the one vSphere server manage both clusters?

Thanks
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Jason ThomasAuthor Commented:
Is my assumption correct? Then I can close this ticket.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Yes, this is correct.
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Jason ThomasAuthor Commented:
Thanks as always
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