Product : VMware, vSAN [SDS]/6.7 U1, ROBO Ent
Feature : Memory Layer, Memory, Storage Support
Content Owner:  Herman Rutten
Summary
DRAM
Details
Each host within a vSAN cluster has a local memory read cache that is 0.4% of the hosts memory, up to 1GB. The read cache optimizes VDI I/O flows for example.