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Esxi not detected for upgrading from 5.0 to 5.5

I upgraded 1 of 2 hosts just fine, but the second does not recognize that Esxi is installed on either virtual disk.
When using an ISO to upgrade the server, it wants to do a clean install. I have a lot of configurations with ISCSI and vmotion networking, that I really do not want to replicate with a clean install if I don't have to.

I am going from version 5.0.0 build 469512 to esxi 5.5.

Any ideas on anything I can look at to see why it is not recognizing that it is installed (Installed on 1st Virtual disk)
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BKennedy2008
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BKennedy2008
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BKennedy2008Author Commented:
I also tried from 5.0 to 5.1 and is not recognized either
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BKennedy2008Author Commented:
Just noticed that the datastore that the ESXi is installed is at VMFS3. DO I need to upgrade that store to version 5 prior to upgrading the ESXi
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BKennedy2008Author Commented:
Upgraded to vmfs5 and still same results. Will do fresh install tomorrow if no ideas
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
You do not have to upgrade VMFS from 3.0 to 5.0,

I'm afraid this happens sometimes, and you will need to do a fresh virgin installation.

But to be honest a FULL New Install, is better than an upgrade, carrying the old baggage.

It should not take very long to setup the host again from memory or documentation.

If you've not done it yet, take screenshots to aid you.
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BKennedy2008Author Commented:
I did- Thanks. Seems like it will be the route I will take.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Just check your hardware is supported for ESXi 5.5, requriements have changed, especially with the CPUs.
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BKennedy2008Author Commented:
Good to go, thanks. Have 2 Exact same servers. Just weird 1 did not want to do an upgrade.

Thanks
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Try my article, and do, an offline upgrade, if you want to try....

HOW TO: Upgrade from VMware vSphere Hypervisor ESXi 5.1 to VMware vSphere Hypervisor ESXi 5.5 for FREE

The above instructions also work for 5.0!
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BKennedy2008Author Commented:
I have not dived into it yet, but would like to see an article on deploying the add-on VUM.
I will try out the command line upgrade.
thnks
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