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S | A | N | S |
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B | A | N | S | S |
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A | M | M | O | 10255 |
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Figure 78. Update to 1st Snapshot & 1st Write to Source
Figure 79, page 148 shows the creation of a second snapshot and a second write operation to the source volume. The original data, N, A and P, from sectors 5, 9 and 13 are first copied to the Snapshot 1 & 2 and then the new data, B, E and B, are written to the source volume.
Because snapshot volumes are independent of each other, the original data must be written to each relevant snapshot, as in Snapshot 1 and 2. The pointer table is only between a single snapshot and its source; never to parts of other snapshots. Therefore, if one snapshot volume fails, no other snapshot is affected.
volume create snapshot
Chapter 8: Advanced Volume Operations | 147 |