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High VMware or application latency but ONTAP and UM show low due to bad upstream SFP

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ontap-9
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perf
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Applies to

  • ONTAP 9
  • Any user environment such as ESXi
  • NAS protocols and iSCSI

Issue

  • High latency is seen in VMware ESXi or application response time
  • ONTAP latency is low
  • Active IQ Unified Manager shows low response time as well

Example: vSphere reports high-volume latency or the ESX host reports latency in the log:

KCS_QOS1.png

2020-09-17T01:31:14.178Z cpu44:2098185)WARNING: ScsiDeviceIO: 1564: Device naa.600a0920002002020202020202020202 performance has deteriorated. I/O latency increased from average value of 744 microseconds to 1515626 microseconds.

Example: qos statistics volume latency show command shows low latency:

Cluster::> qos statistics volume latency show -volume Example_Vol -vserver VS1
Workload            ID    Latency    Network    Cluster       Data       Disk    QoS Max    QoS Min      NVRAM      Cloud  FlexCache    SM Sync         VA
--------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
-total-              -     2.21ms   101.00us    75.00us   400.00us     1.62ms       0ms        0ms     7.00us        0ms        0ms        0ms        0ms
Example_Vol..     3195  1295.00us   478.00us        0ms   777.00us    26.00us       0ms        0ms    14.00us        0ms        0ms

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