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CONTAP-649801: High write latency on MetroCluster IP due to ISL bottleneck

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ontap-9
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metrocluster
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Issue

  • High write latency spikes observed on MetroCluster IP configurations
  • Back-end switches sending excessive amount of L2 pause frames to the controllers, indicating the remote ISL bandwidth is not sufficient to handle all incoming traffic
  • Long CPs when writing IOs to remote aggregate plexes: 


Thu Apr 02 16:20:32 +0200 [nodeA1: wafl_exempt04: wafl.cp.toolong:error]: Aggregate aggr_root experienced a long CP.
Thu Apr 02 16:20:37 +0200 [nodeA1: wafl_exempt04: wafl.cp.toolong:error]: Aggregate aggr_data1 experienced a long CP.
Thu Apr 02 16:20:37 +0200 [nodeA1: wafl_exempt24: wafl.cp.toolong:error]: Aggregate aggr_data2 experienced a long CP.

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