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Its the same level of vmfs, but i would highly suggest you unplug your storage (or unzone it if necessary) so that you do not have an accidental format or wipe of the storage.
Best practice is to always try to remove storage prior to rebuild or upgrade.
I agree, detach your storage before you do the upgrade. Not detaching is definitely a risk.
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Thanks, I definitely planned to unplug the fiber and reattach only after the install it complete. Glad to know it is going to be as easy as that. I remember with ESX 2.5 to 3.0 upgrade there was VMFS compatibility issues due to different versions so I just wanted to double check.