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Type-XDP SnapMirror transfers in fan-out topology are slower than expected

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snapmirror
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dp
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Applies to

ONTAP 9.1 - 9.5P3

SnapMirror source node has fan-out SnapMirror relationships

Issue

  • A SnapMirror source node has one or more slower fan-out SnapMirror relationships as well as other, faster fan-out SnapMirror Relationships from the same source node.
  • In some cases, one or more of the slower SnapMirror relationship(s) throttle the throughput rate achieved by the faster SnapMirror relationships. When the slower SnapMirrors are aborted or otherwise idle, the faster SnapMirror relationships go back to expected speeds.
 
Note: This KB only applies when fast SnapMirrors are throttled by slower SnapMirrors transferring from the same source node at the same time. In these cases, the fast SnapMirrors run at expected speeds when the slower SnapMirrors are aborted or otherwise not transferring.
 
  • As an example, consider a SnapMirror source node has an InterCluster SnapMirror relationship going over a WAN link acheving at-best a throughput of 15MB/s.
  • This same SnapMirror source node also has an intra-cluster SnapMirror relationship replicating over a 10Gbps cluster interconnect acheiving a throughput of 100MB/s. 
  • When the slower InterCluster SnapMirror is transferring, the faster intra-cluster SnapMirror slows to ~15-20MB/s.
  • When the slower InterCluster SnapMirror is aborted, the faster intra-cluster SnapMirror picks back up to the expected 100MB/s throughput.

 

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