Storage Spaces Direct (S2D) Calculator

Estimate Storage Spaces Direct capacity. Updates in real-time as you change values.

Enter drive sizes in TB (Terabytes, base-10). Calculations use TiB (Tebibytes, base-2) for capacity. Assumes faster tier is cache (if multiple tiers exist). Reserves 1 capacity drive per node (max 4). MAP efficiency depends on node count and mirror %.

Cluster Settings
20% Mirror (Remaining % is Parity)
Drive Configuration (Per Node)

Media Summary (Entire Cluster)

Total Drives (All Nodes): ...

Drives by Type: NVMe: 0, SSD: 0, HDD: 0

Cache Drives (Estimated): ...

Capacity Drives (Estimated): ...

Total Raw Capacity: ... TiB (Based on all drive types)

Capacity Tier Raw Capacity: ... TiB (Pool used for usable capacity)

Cluster Capacity Summary

Resiliency Setting: ...

Reserved Capacity Drives: ... Reserving 1 capacity drive per node (max 4)

Reserved Capacity: ... TiB (From capacity tier)

Raw Capacity Tier (After Reserve): ... TiB

Estimated Usable Capacity: ... TiB

Storage Efficiency: ...% (Usable TiB / Total Raw Physical TiB)

Recommended Volume Summary

Recommended Volumes: ... Simplified recommendation: One volume per node.

Approx. Capacity per Volume: ... TiB