单项选择题A customer using an IBM System Storage DS8700 is facing performance problems. After the analysis by the technical specialist, the diagnosis indicates that the cache hits may be improved by a cache upgrade. How can the system be monitored in order to check the benefits of the cache upgrade()
A.using the "vmstat" command on the AIX servers connected via SAN to the DS8700 system
B.look at the IOPS using the DS8700
C.reading the performance reports via Tivoli Storage Productivity Center for Disk
D.generating reports using theTotalStorage Expert