单项选择题A customer using an IBM System Storage DS8300 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 DS8300 system
B.looking at the number of I/O managed by the DS8300 system
C.reading the performance reports via TotalStorage Productivity Center for Disk
D.generating reports using the TotalStorage Expert