Snapshot data is data in the pool, which is replaced data. Use this workflow to store snapshot data in the pool.
- Create a Thin Image pair. You can create a pair with the snapshot attribute (snapshot pairs). The pair is in "PAIR" status.
- The host updates the primary volume.
- Split the snapshot pairs. The snapshot data of the primary volume is stored (Snapshot data A in the figure below).
- The host updates the primary volume again.
- Split the snapshot pairs. The updated data in the primary volume is stored as snapshot data (Snapshot data B in the following figure). In the event of data corruption, you can recover using this snapshot data.
The following figure illustrates how data in the pool is replaced.
Note: Because Snapshot data A and Snapshot data B are handled as a Thin Image S-VOL of a snapshot pair, the host can reference the P-VOL, Snapshot data A, and Snapshot data B.