I know this is an old post but I have this solved. You have to create separate storage groups for each host and then individually add the boot LUN to each to reserve LUN ID 0 (it has to boot from here.) Once you have all of those configured you then go and add the datastore LUNs to all of the ESXi storage groups one at a time until all of them are added to all group. This guarantees all of the datastores will have the same LUN ID across the cluster.
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