Move ESX host from one vCenter to another

CptnTrips
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I have a cluster of three hosts running vSphere 4.0 with a 32bit vCenter 4.0 server. Its a fairly simple environment with a small number of resources groups and about 50 servers.

I want to move these three hosts into a new cluster of 4.1 hosts (two) with a 64bit vCenter.

The hosts are all the same servers with the same specs. It seems like the easiest thing to do would be to move my hosts in the 4.0 server and add them to the 4.1 server. It seems pretty straight forward. Is this a bad way to go about this? Will there be problems when I connect the 4.0 hosts to the 4.1 cluster?

If I migrate from one to the other, I need all of the extra space for the migration and I do not have it. This seems like the simplest easiest way to keep everything in place.
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Commented:
By disconnecting your hosts and reattaching them, you will lose all the performance statistics on the hosts and VMs.  You will also have to readd permissions and folders if you had any on the original VC server.  If none of these are a concern, then there is no reason to not do it that way.  There is a migration utility that will export out all these settings and allow you to import them back to the new VC, but vCenter cannot be installed on the new server yet as the migration process installs it itself.
Not sure what you mean by all the extra space for the migration?  It does not make a copy of the VMs, only the configurations and settings of VC server.
Top Expert 2010
Commented:
That is what I did upgrading to 4.1. Set up new vCenter with clusters, then removed hosts from old vCenter and added them to new vCenter. Worked great.

Good Luck

Author

Commented:
Tripyre - The two I tested by migrating required the same amount of space they were already using to migrate. Once the migration was complete, a copy still remained in the 4.0 vCenter that I had to delete.

All of these host point to the same shared virtual storage. I was hoping for just moving to the new vCenter without doing anything on the storage side but the best I can tell from my two tests runs is that this is not the case. Once the migrations were complete, their respective amounts of space were gone from the LUNs until I deleted the original.

If there is a way to just move them without an actual migration of the files, that would be great.
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Luciano PatrãoICT Senior Infraestructure  Engineer  
Commented:
Hi

What Storage do you have? Local? SAN?? NAS?

Because just moving the hosts between vCenter is nothing special. Just add the host into the new host(he will ask and warning about another vCenter using that host, you just say yes). Then the new host will be on the new vCenter.

Regading the Storage, since the storage is pointing to the hosts, I don't understand the Storage question about the free space.

Jail

Author

Commented:
Both the 4.0 and 4.1 hosts are all pointed to the same shared SAN and can see the same virtual LUNs. I added the 4.0 hosts to the 4.1 vCenter and all was fine. I was not concerned about historical performance data and I only had one case of special permissions setup.

Trip indicated that additional space should not have been required. My question was regarding that. I initially just tried to migrate the machines in. But doing it this way requires space for the VM even if it's not going to another LUN. I migrated two machines, it used the space respective to each machine and it left a copy of the machine in the old vCenter. He indicated that shouldn't be the case so I wasn't sure if there was some step I was skipping or something.
Luciano PatrãoICT Senior Infraestructure  Engineer  

Commented:
Hi

But if you migrate the VMs between host, they still stay in the same Storage. Only if you doing vStorage(Storage Motion) that will need space in other LUNs.

Jail

Author

Commented:
I migrated two VM's from my 4.0 vCenter to my 4.1 vCenter. They required the space they took up even though they were not moving LUNs. If this is not what should have been, I'm not sure why it was. But I am sure this was the case for the two I did.

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