How does Isilon SnapshotIQ use storage for snapshots?

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Accepted Answer

A. Through Changed Block Tracking and only changed data blocks are saved

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B. Works on the file level and saves the entire file no matter what has changed

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C. Works with 4 KiB blocks and will always use that amount of storage, no matter what has changed

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D. Through Changed Block Tracking and always uses a 4 KiB block, even if the data changed is less than

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