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What will XDP transfer per SnapMirror update?

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Applies to

  • ONTAP 9
  • Logical replication with storage efficiency (LRSE).

Answer

  • Each update of XDP-type SnapMirror is an incremental-only transfer.
  • Because it uses a Logical replication engine named LRSE which only transfers the difference between two Snapshot copies from the primary to the secondary.
  • Incremental can be calculated by command volume snapshot show-delta.

Additional Information

Logical replication with storage efficiency (LRSE).
LRSE uses block-level metadata and knowledge of the file system to determine differences between Snapshot copies at the indirect pointer level. LRSE organizes the transfer of data from the source to the destination in two streams
.....
The performance characteristics are also like those of the original block replication engine because the replication engine only transfers the difference between two Snapshot copies from the primary to the secondary. This incremental-only transfer leads to savings in terms of storage and network bandwidth. Starting with ONTAP 9.3, SnapMirror XDP mode replaces SnapMirror data protection (DP) mode as the SnapMirror default. More details can be found at XDP replaces DP as the SnapMirror default.
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