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Latency increases during volume move cutover phase

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Category:
ontap-9
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perf
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Applies to

ONTAP 9

Issue

All the volumes on the filer witness a short slowness during the volume move cutover phase of a volume on this node. 

Example: Below is the performance statisitcs observed on one impacted volume from both the client and the filer during the cutover phase. 

Note: This is not the volume going through the volume move cutover phase

VDbentch log:11 18, 2020  interval  i/o    MB/sec   bytes   read   resp     read    write     resp    resp  queue  cpu%  cpu%
                       rate   1024**2   i/o     pct   time     resp     resp      max   stddev depth sys+u   sys

13:32:50.043  501   17260.00   269.69   16384  79.79   0.921    0.910   0.965    7.402   0.311  15.9  44.2  35.6
13:32:51.043  502   15972.00   249.56   16384  79.66   0.996    1.033   0.850   25.002   0.889  15.9  44.8  35.6
13:32:52.042  503    8553.00   133.64   16384  80.09   1.860    1.868   1.829    8.574   1.722  15.9  22.0  16.5
13:32:53.042  504    3407.00    53.23   16384  80.83   4.693    4.690   4.704    9.185   1.325  16.0   8.9   7.3
13:32:54.044  505    3351.00    52.36   16384  79.14   4.768    4.769   4.765    9.339   1.131  16.0  11.4   9.0
13:32:55.042  506    3406.00    53.22   16384  80.59   4.679    4.694   4.616   10.017   1.302  15.9  10.8   8.2
13:32:56.042  507    3339.00    52.17   16384  81.28   4.796    4.786   4.836    9.095   1.194  16.0  10.6   8.1
13:32:57.042  508    3399.00    53.11   16384  80.94   4.700    4.697   4.714    9.183   1.204  16.0   9.7   8.2
13:32:58.043  509    3570.00    55.78   16384  81.32   4.462    4.473   4.417    9.443   1.454  16.0  10.3   8.7
13:32:59.042  510    6971.00   108.92   16384  80.10   2.297    2.315   2.225   13.173   1.853  15.9  21.1  16.6
13:33:00.044  511   18303.00   285.98   16384  79.92   0.868    0.870   0.858    4.062   0.234  15.9  46.5  39.6
13:33:01.043  512   18439.00   288.11   16384  80.43   0.863    0.874   0.814    6.378   0.353  15.9  48.5  39.3
13:33:02.042  513   17853.00   278.95   16384  79.77   0.891    0.901   0.851    9.553   0.419  15.9  53.1  36.9

qos statistics volume latency show:
2020/11/18 13:32:48 Workload            ID    Latency    Network    Cluster       Data       Disk    QoS Max    QoS Min      NVRAM      Cloud  FlexCache    SM Sync         VA
2020/11/18 13:32:48 --------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
2020/11/18 13:32:48 volume2  51455   360.00us   261.00us        0ms    26.00us    69.00us        0ms        0ms     4.00us        0ms        0ms        0ms        0ms
2020/11/18 13:32:51 volume2  51455   372.00us   264.00us        0ms    28.00us    76.00us        0ms        0ms     4.00us        0ms        0ms        0ms        0ms
2020/11/18 13:32:54 volume2  51455  1004.00us   160.00us        0ms   682.00us   159.00us        0ms        0ms     3.00us        0ms        0ms        0ms        0ms
2020/11/18 13:32:57 volume2  51455     4.21ms   138.00us        0ms     3.95ms   122.00us        0ms        0ms     4.00us        0ms        0ms        0ms        0m
2020/11/18 13:33:00 volume2  51455     3.81ms   137.00us        0ms     3.54ms   127.00us        0ms        0ms     4.00us        0ms        0ms        0ms        0ms
2020/11/18 13:33:03 volume2  51455   366.00us   143.00us        0ms   128.00us    92.00us        0ms        0ms     3.00us        0ms        0ms        0ms        0ms
2020/11/18 13:33:06 volume2  51455   322.00us   132.00us        0ms   105.00us    82.00us        0ms        0ms     3.00us        0ms        0ms        0ms        0ms

 

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