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Swarm calculates storage use by addressable object in order to support conventional (storage filer) reporting of file counts and space usage. This approach tracks cluster-wide capacity by counting logical objects (the unique content of uploaded and versioned files) rather than actual streams (the raw space that is consumed by all Swarm components, including replicas, EC segments, context objects, and manifests). The versions add to the object totals; if a cluster held one 20 MB image with 3 replicas and 4 prior versions: 5 logical objects and ~100 MB logical space is consumed.
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