During an initial microcode load of the storage controller, space in {TAIL ~ the cache} and {HEAD ~ NVS} of each cluster is allocated to buffers with the remaining cache and NVS space being allocated to customer data 
During an initial microcode load of the storage controller , space in { TAIL ~ the cache } and { HEAD ~ NVS } of each cluster is allocated to buffers with the remaining cache and NVS space being allocated to customer data
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH