Hardware Capacity Guidelines
To account for the overhead necessary for consistent performance, the formulas below are suggested as initial starting points for sizing the amount of space allocated for BigMemory Hybrid operation.
Minimum SSD flash memory requirement = planned total data size * 3.2
Minimum DRAM requirement = planned maximum number of elements * (168 + key size)
Note:
It is strongly recommended to configure enough offheap to accommodate all cache keys in DRAM.