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Network latency for FC SAN due to noisy neighbour

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Category:
ontap-9
Specialty:
san
Last Updated:

Applies to

  • ONTAP
  • FC-SAN

Issue

  • The application reports an IO wait/timeout.
  • The QOS stats show the latency from the network layer.
  • Issue start and end times is inline with the increase in userworkload on one or few LUN/ Volume.
  • The latency is seen even on volume with no deviation in workload.
 
cluster::> qos statistics volume latency show -vserver SVM1 -volume volume_SAN1
Workload        ID    Latency    Network    Cluster       Data       Disk        QoS      NVRAM      Cloud
----------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
volume_SAN1  17882     20.51ms    20.51ms      0ms        0ms        0ms        0ms        0ms        0ms  
volume_SAN2   5232     15.00ms    15.00ms      0ms        0ms        0ms        0ms        0ms        0ms  
volume_SAN3  17160     16.00ms    16.00ms      0ms        0ms        0ms        0ms        0ms        0ms
  • The physical connectivity report has no issue.

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