However, a time for making a magnetic disk unit “operating” upon receiving an access is required, and {TAIL ~ the performance} of {HEAD ~ the disk array unit} as a whole is significantly degraded 
However , a time for making a magnetic disk unit “ operating ” upon receiving an access is required , and { TAIL ~ the performance } of { HEAD ~ the disk array unit } as a whole is significantly degraded
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH