Redundancy is a trade. Price it explicitly.

Independent, identical shard availability model. No live BTFS performance, placement, repair, latency, cost, or correlation data.

6 data + 3 parity

Any 6 of 9 available shards reconstruct the object. Parity tolerates loss; it also adds stored bytes.

Recoverability,
with its assumptions.

NO ANALYSIS

—RECOVERABILITY
—TOLERATED UNAVAILABLE
—STORED SIZE
—OVERHEAD

LAYOUT PROOF

NO LAYOUT

AVAILABILITY SENSITIVITY

Binomial model assumes independent, identical shard availability; correlated outages can be materially worse.

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