Product : Microsoft, S2D [SDS]/2.0, Datacenter
Feature : Memory Capacity, Memory, Storage Support
Content Owner:  Herman Rutten
Summary
S2D Cache (Hybrid): non-configurable
CSV Cache: configurable
Details
Storage Spaces Direct (S2D) uses 4GB of DRAM per 1TB of configured cache space on each node. This cache is useful only in hybrid storage configurations (SSD + HDD, NVMe + SSD or NVMe + HDD). If you implement an all-flash solution (only SSD or only NVMe) the cache is not enabled.

With regard to Cluster Shared Volumes (CSVs) a Block Cache can be configured. Microsoft recommends configuring 2GBs of CSV Block Cache or more.

When S2D is implemented using the dual-layer (disaggregated) model, almost all of the memory on the storage hosts can be used for caching.
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