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AcustomerusinganIBMSystemStorageDS8300isfacingperformanceproblems.Aftertheanalysisbythetechnicalspecialist，thediagnosisindicatesthatthecachehitsmaybeimprovedbyacacheupgrade.Howcanthesystembemonitoredinordertocheckthebenefitsofthecacheupgrade（）
A.usingthe"vmstat"commandontheAIXserversconnectedviaSANtotheDS8300system
B.lookingatthenumberofI/OmanagedbytheDS8300system
C.readingtheperformancereportsviaTotalStorageProductivityCenterforDisk
D.generatingreportsusingtheTotalStorageExpert
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