The correct sequence of steps for Snap-based replication on XtremIO is:

Create the snapshot

Get the DIFF between the snapshot and the root volume

Create a second snap, and then retrieve the DIFF between the first and second snapshot

Transfer the DIFF

Create and promote the snapshot

Snap-based replication on XtremIO involves the following steps:

Create the snapshot: This step involves taking a snapshot of the source volume that will be used as the baseline for replication.

Get the DIFF between the snapshot and the root volume: Here, the differences between the snapshot and the root volume are calculated. This is necessary to understand what changes have been made since the last snapshot.

Create a second snap, and then retrieve the DIFF between the first and second snapshot: A second snapshot is created to capture the latest state of the volume. The differences (DIFF) between the first snapshot and the second snapshot are then calculated.

Transfer the DIFF: The differences identified between the snapshots are transferred to the target volume. This ensures that only the changes are replicated, optimizing the replication process.

Create and promote the snapshot: Finally, the snapshot is created and promoted to ensure the target volume is updated with the latest changes.

This sequence ensures efficient and accurate replication by focusing on the changes between snapshots, rather than replicating the entire volume each time.