{HEAD ~ The storage control unit} receives and processes write requests from the host devices and directs that data updates be temporarily stored in the cache in one cluster and copied to {TAIL ~ the NVS} of the other cluster 
{ HEAD ~ The storage control unit } receives and processes write requests from the host devices and directs that data updates be temporarily stored in the cache in one cluster and copied to { TAIL ~ the NVS } of the other cluster
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