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SRYANFlag for United States of America

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ESX 3.5 Upgrade to ESX 4.1

Currently we have 2 Virtual Centers. A vCenter 2.5 and vSphere 4.1. Can the ESX servers share the shared storage between the ESX 4 and ESX 3.5 hosts in different Virtual centers?
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Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)
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Yes. (migration is then easier, because you can vMotion off one ESX 3.5 host to a ESX 4.1 host)

Upgrade Virtual Hardware, and VMware Tools and migration complete.
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flyingsky

Do you mind explain what you want to achiev more clearly? I don't seem to be able to understand your question. Thanks.
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vMotion will not work because the VMs are managed by 2 different Virtual Centers (vCenter2.5 and vSphere4).

My goal is to migrate the VMs from vCenter 2.5 to vShpere 4.

My question is if I added the storage that the ESX 3.5 servers are using in the vCenter 2.5 to the ESX servers in the vSphere 4 infrastructure would this cause any issues? I could then shut down the VMs running in vCenter 2.5. Remove then from inventory and import then into the vSphere 4 environment.
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flyingsky

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Remove the hosts from VC 2.5.

Add hosts to VC 4.0

vMotion.

or, you could use VMware Converter to MIgrate and Convert from VMs on VC 2.5/ESX 3.5 to new VMs on VC 4.0/ESX 4.1.

this would then give you a roll back position if all went wrong.
A side note to hanccocka's suggestion, in order for the VC4 to manage his ESX3.5 host, you need to setup a license server, which is not needed after you upgrade to 4.1
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he should already have license server which is currently giving licenses to ESX 3.5!

but this also needs specifying in vSphere 4.0 config after migration.
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My Plan:

1. We are currently running ESX 3.5 servers in vCenter 2.5 the virtual machines run on LUN A, B, and C.
2. Present LUNs A, B, and C to ESX 4.1 servers running in vSphere 4 (a new Virtual Center).
3. Shutdown and remove from inventory a VM from ESX 3.5 (vCenter 2.5).
4. Browse data store from ESX 4.1 server (in vShpere 4) and import VM from the share storage on LUN A, B, or, C. Now the Virtual machine running from a different host in a different Virtual Center and has been moved to the new environment.

Will sharing the storage between 2 different Virtual Centers and ESX versions cause any issues?
Your plan should work no problem. You may want to upgrade the vm hardware version and VM tools after.
if you have no VMotion, or don't trust it yes, that will work, more work but yes.

No issues with storage.
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