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ONTAP iSCSI SAN continuous interruptions

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ontap-9
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san
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Applies to

  • ONTAP iSCSI SAN
  • VMware ESXi

Issue

  • Continuous interruptions for VMware vSphere cluster  using particular ONTAP node
  • Virtual machines very slow and disconnecting users
  • CRC errors detected on ONTAP
  • Cisco switch port reports packet loss
vmkernel log :
tail -f /var/log/vmkernel.logVMW_SATP_ALUA: satp_alua_issue CommandOnPath Path command Failed with transient error status Transient storage condition
  • qos statistics volume latency show shows high latency in the Network column for iSCSI SAN workloads 
cluster::> qos statistics volume latency show -node san_node1

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

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