What the reason that LUN cannot be added to existing hosts?

3 esx hosts with ESX 3.5U3


NetApp FAS2040

I have an existing LUN which currently has VM's installed and running on that LUN. I want to add this LUN to the new ESX host.

On this new host, I went into the Storage Adapters and clicked "Rescan". The message shows me the LUN will be formatted. Then, I stop configuring.

I report to vmware support center, i've been told the LUN partition error and it can be fixed.

Anyone can tell me the reason, what cause LUN information loss?

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