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ONTAP single LUN latency at network layer since ONTAP 9.3

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ontap-9
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Applies to

ONTAP 9.3 & above

Issue

  • Latency is seen due to ONTAP having latency in the network layer of qos statistics volume latency show.
  • High latency observed from the command output : statistics lun show

cluster::> statistics lun show -lun <lun-path> -interval 5 -iterations 5

cluster: 3/29/2023 03:55:10


                                                                                       *Total Read Write Other      Read   Write    Latency
                                                                 Lun             Vserver    Ops  Ops   Ops   Ops     (Bps) (Bps)    (us)
-------------------------------------------------------------------- ------------------- ------ ---- ----- -------------------------------------------

/vol/essspdb3_4_sppdbvg3_fc_vol03/essspdb3_4_sppdbvg3_fc_vol03_lun01DDCNTAPCL21_MCK_SAN   1310 1273        36     0 674478489 1435238   41402

  • Read throughput is high (perhaps close to 1 GB/s)

Example:

Cluster1::> qos statistics volume latency show -volume vol1lun1 -vserver svm1
Workload            ID    Latency    Network    Cluster       Data       Disk        QoS      NVRAM
--------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ----------
-total-              -     5.52ms     4.41ms    15.00us   981.00us   113.00us        0ms        0ms
vol1lun1         10210    14.60ms    14.49ms     6.00us    91.00us    12.00us        0ms        0ms
-total-              -     4.08ms     3.68ms    13.00us   310.00us    71.00us        0ms        0ms
vol1lun1         10210    15.56ms    15.47ms    39.00us    54.00us     1.00us        0ms        0ms
-total-              -     4.34ms     3.76ms    14.00us   483.00us    85.00us        0ms        0ms
vol1lun1         10210    78.37ms    77.86ms    10.00us   430.00us    69.00us        0ms        0ms
-total-              -     5.08ms     4.44ms    15.00us   514.00us   109.00us        0ms        0ms
vol1lun1         10210    86.62ms    85.86ms     5.00us   580.00us   174.00us        0ms        0ms

Cluster1::> qos statistics volume performance show -volume vol1lun1 -vserver svm1
Workload            ID     IOPS       Throughput Latency
--------------- ------ -------- ---------------- ----------
-total-              -   240958      2408.45MB/s   366.00us
vol1lun1         10210    52416      1055.11MB/s   105.00ms
-total-              -   248647      2378.91MB/s   401.00us
vol1lun1         10210    52516      1106.35MB/s   120.00ms
-total-              -   252124      2070.41MB/s   384.00us
vol1lun1         10210    49125       995.11MB/s   108.00ms

 

 

 

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