What Are the Ways to Implement Snapshot? What Are Differences Between Them? How Does the OceanStor 9000 Implement Snapshot?

Copy On Write (COW) and Redirect On Write (ROW) are the two ways to implement snapshot.

COW copies data objects protected by a snapshot to other locations or objects before replacing these data objects with new data, so that the original data objects serve as snapshot data.

ROW writes new data to new locations or objects, instead of replacing the original data protected by a snapshot.

The OceanStor 9000 implements the snapshot function based on metadata COW and data ROW.

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