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Slow SnapMirror or volume move or low throughput due to BRE/LRSE Throttling on ONTAP 9.14.1 or higher

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Applies to

  • ONTAP 9.14.1 and higher
  • SnapMirror
  • Block Replication Engine (BRE)
  • Logical Replication with Storage Efficiency (LRSE)
  • Volume Move
  • CBS (Cloud Backup Service) / SnapMirror cloud (SMc)

Issue

  • Low throughput during SnapMirror transfers due to Replication Engine throttling
  • Verify that the following items have been eliminated as potential issues first
    • Avoid running too 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
  • Low throughput during CBS transfers to cloud vendor like Azure due to Replication Engine throttling on source controller. 

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