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High latency seen in ONTAP on FlexGroup constituents

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312
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Public
Votes:
1
Category:
ontap-9
Specialty:
perf
Last Updated:

Applies to

  • ONTAP 
  • FlexGroups

Issue

  • High latency is seen in qos statistics volume performance show and qos statistics volume latency show as Data latency
  • This only happens on FlexGroup volumes with __ in the volume name
  • Example:
Cluster::> qos statistics volume performance show
Workload            ID     IOPS       Throughput    Latency
--------------- ------ -------- ---------------- ----------
-total-              -     1152        21.22MB/s    88.83ms
VOL1_FG_PRD__..   8777      282         2.22MB/s   195.11ms
VOL1_FG_PRD__..   7862      266         9.93MB/s    58.90ms
VOL2_FILE_NON..  27814      187       169.58KB/s   180.00us
VOL1_FG_PRD__..   3708      187         6.09MB/s    78.16ms
VOL1_FG_PRD__..  25459      144         2.72MB/s   118.99ms
volapplicatio..  27101       82        97.33KB/s   232.00us
VOL1_FILE_UAT..   5994        5            0KB/s   466.00us
 
Cluster::> qos statistics latency show -iterations 0 -rows 10 -refresh-display false -node node1
Policy Group            Latency    Network    Cluster       Data       Disk    QoS Max    QoS Min      NVRAM    Cloud  FlexCache    SM Sync         VA
-------------------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
-total-                 64.69ms   593.00us        0ms    63.93ms    81.00us        0ms        0ms    89.00us        0ms        0ms        0ms        0ms
User-Best-Effort        64.69ms   593.00us        0ms    63.93ms    81.00us        0ms        0ms    89.00us        0ms        0ms        0ms        0ms

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