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• Cluster: A Rook cluster provides the basis of the storage platform to serve block, object stores, and shared file systems.
• Pool: A pool manages the backing store for a block store. Pools are also used internally by object and file stores.
• Object Store: An object store exposes storage with an S3-compatible interface.
• File System: A file system provides shared storage for multiple Kubernetes pods.

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Shared Storage Example

Shamelessly stolen from https://rook.github.io/docs/rook/master/filesystem.html

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