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ESX 4.1 to ESXi 5.1u1 upgrade prerequisite and caveats ?

Hi People,

I'm about to do a bunch of ESX 4.1 to ESXi 5.1u1 hosts upgrade (around 75 - 80 of them) in my current environment.

What are the caveats of migrating from ESX into ESXi 5.1u1 ?

What should I do before the upgrade to make sure that the Force migration while keeping the existing LUNs intact without affecting the hosted VMs ?

Thanks in advance
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ok, so by utilizing VMware Update Manager I'm afraid that the ESX to ESXi upgrade / migration could potentially upgrade all VMhost at the same time.

so in this case I'm planning todo it manually one by one per cluster.

Any area that I need to pay special attention to make sure that the upgrade went smoothy ?
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is there any PreUpgrade Check that I can run in all of my ESX host before I upgrade them all into ESXi ?
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Is there any script to run on the ESX server ?
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