Could server ESXi2 local storage be formatted with VMFS3 from an upgrade situation? Did you ever see the local storage in ESXi2 in the cluster storage in vcenter or never? Also, have you previously unmounted then remounted the local storage on ESXi2, especially after the server joined the cluster? Sometimes I see that in an unmount and then remount the name of the mounting point changes (or gets stuck) by default to something similar, so for example in stead of Datastore 1 you will now have Datastore 1 (1) which may not be obviously distinguishable. So the cluster may be looking for the old datastore name and you may be seeing a different data store name. Adding and removing as stated above may remedy this.
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