Storage Spaces Direct Calculator

Usable

Storage Efficiency: ?

Mirroring has efficiency. Using only mirroring would give available capacity.

At this scale, dual parity uses encoding which has efficiency. Using only parity would give available capacity.

Combining these in the proportions you've chosen gives overall.Excludes reserve.

Usable Resiliency Reserve

Reserve: ?

This deployment has total physical capacity, excluding cache.

We recommend setting aside the equivalent of one capacity drive per server, up to 4 drives, for in-place recovery. This guarantees an immediate, in-place, parallel repair can succeed after the failure of any drive, even before it is replaced. In this case, that's drives x each. See our documentation here for more information.This leaves total physical capacity after reserve.

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