A.The random read of a customer's business IO load accounts for more than 60%. Currently, SATA and SAS are used as tiered storage and SSD is used as cache. This can reduce costs and improve performance.

B.If the number of SSDs is small, the utilization of tiered storage disks is higher

C.Hierarchical storage is recommended if the hotspot data is scattered and changed quickly.

D.If there are many SSDs and hot data is concentrated, smartcache is the best choice