Latest info: have reproduced the "connecting with ANOTHER NFS client to the NFS server resurrects the NFS datastore on the ESXi3 host" phenomenon: left alone, ESXi3 lost the NFS datastore once more. It remains displayed at first, but "empty" when browsing it, then after a "refresh" it disappears from the list of datastores. But after I connect with a Win7 client via NFS to the 2012R2, a refresh of the datastores will make it appear again, and browsing will work again as well!!!! It's as if the NFS server expects some "keep alive" signals...
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