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（）
- Ausing the "vmstat" command on the AIX servers connected via SAN to the DS8700 system
- Blook at the IOPS using the DS8700
- Creading the performance reports via Tivoli Storage Productivity Center for Disk
- Dgenerating reports using theTotalStorage Expert