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High disk latency due to Snapmirror forward sync

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Category:
ontap-9
Specialty:
perf
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Applies to

  • ONTAP
  • Snapmirror

Issue

  • High latency was noticed from the disk layer.
cluster1::> qos statistics volume latency show -vserver svm1 -volume vol1
Workload            ID    Latency    Network    Cluster       Data     Disk    QoS Max    QoS Min      NVRAM  
--------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
-total-              -     4.71ms   185.00us     7.00us   468.00us     4.04ms        0ms        0ms    11.00us
vol1-wid32140    32140    22.22ms    86.00us   125.00us   904.00us    21.11ms        0ms        0ms     1.00us
-total-              -     4.58ms   253.00us     7.00us   991.00us     3.32ms        0ms        0ms    11.00us
vol1-wid32140    32140    29.69ms    90.00us   162.00us     2.61ms    26.82ms        0ms        0ms     1.00us
-total-              -     2.55ms   229.00us     8.00us   589.00us     1.71ms        0ms        0ms    13.00us
vol1-wid32140    32140    18.84ms    61.00us   314.00us   136.00us    18.32ms        0ms        0ms     1.00us
-total-              -     4.33ms   198.00us     9.00us  1221.00us     2.88ms        0ms        0ms    13.00us
vol1-wid32140    32140   177.16ms   113.00us   226.00us   108.03ms    68.79ms        0ms        0ms     2.00us
  • The issue started after migrating the workload to the DR site.

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