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Slow SnapMirror performance and low throughput do to BRE/LRSE Throttling

Last Updated:

Applies to

  • ONTAP 9
  • SnapMirror
  • Block Replication Engine (BRE)
  • Logical Replication with Storage Efficiency (LRSE)


  • Low throughput during SnapMirror transfers due to Replication Engine throttling
  • Verify that the following items have been eliminated as potential issues first
    • Avoid running to many SnapMirror transfers at once
    • Spread out the SnapMirror transfers to reduce impact
    • Initiate SnapMirror transfers during times of lower user workloads and lower CPU activity
    • Check to see if the global throttling mechanism is in use for SnapMirror
    • If the replication traffic is going over a WAN, you can enable Network Compression for those SnapMirror policies to improve performance
      • Note: Do not use network compression in cases of already high CPU utilization


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