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Why does qos statistics volume latency show have disk instead of cloud latency?

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Applies to

  • ONTAP 9.2 to 9.7
  • FabricPool

Answer

  • Latency in qos statistics volume latency show may record in the wrong column due to bug 1290868
  • Instead, it may report as disk latency in the Disk column
  • Use statit to identify how much of latency is due to disk and how much is due to cloud latency

Example: vol1 has almost 32 milliseconds of latency on an AFF-A220 and almost 28 reports as disk, but is really due to FabricPool cold tier, or the Cloud column.

::> qos statistics volume latency show -volume vol1 -vserver svm1
Workload            ID    Latency    Network    Cluster       Data       Disk        QoS      NVRAM      Cloud  FlexCache    SM Sync
--------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
-total-              -   370.00us   190.00us        0ms   120.00us    60.00us        0ms        0ms        0ms        0ms        0ms
vol1              8036    32.21ms   797.00us     2.00us     3.38ms    27.98ms        0ms        0ms    52.00us        0ms        0ms
-total-              -   602.00us   191.00us     1.00us   177.00us   233.00us        0ms        0ms        0ms        0ms        0ms
vol1              8036    31.06ms   711.00us     5.00us     2.70ms    27.63ms        0ms        0ms    15.00us        0ms        0ms

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