Skip to main content
NetApp Knowledge Base

Latency increases during volume move cutover phase

Views:
230
Visibility:
Public
Votes:
0
Category:
ontap-9
Specialty:
perf
Last Updated:

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

 

Scan to view the article on your device
CUSTOMER EXCLUSIVE CONTENT

Registered NetApp customers get unlimited access to our dynamic Knowledge Base.

New authoritative content is published and updated each day by our team of experts.

Current Customer or Partner?

Sign In for unlimited access

New to NetApp?

Learn more about our award-winning Support

 

  • Was this article helpful?