Skip to main content
NetApp Knowledge Base

High ONTAP latency reported but not in qos statistics volume latency show

Views:
4,378
Visibility:
Public
Votes:
2
Category:
ontap-9
Specialty:
perf
Last Updated:

Applies to

  • ONTAP 9
  • CIFS
  • NFS
  • ActiveIQ Unitified Manager

Issue

  • High latency is observed from ActiveIQ Unitified Manager or qos statistics volume performance show
  • But running qos statistics volume latency show does not indicate a delay.
  • Both the clients and ONTAP report a high latency despite no obvious CPU or disk bottlenecks.

Example:

nas-cm95::> qos statistics volume performance show
Workload            ID     IOPS       Throughput    Latency
--------------- ------ -------- ---------------- ----------
-total-              -       78         0.07KB/s  111.01ms
data1-wid30897   30897       78         0.07KB/s  521.01ms
-total-              -       84         0.07KB/s    10.02s
data1-wid30897   30897       84         0.07KB/s    25.02s
-total-              -      158         0.08KB/s     8.55s
data1-wid30897   30897      158         0.08KB/s    10.07s
-total-              -      158         0.08KB/s     2.97s
data1-wid30897   30897      158         0.08KB/s     3.11s
nas-cm95::> qos statistics volume latency show
Workload            ID    Latency    Network    Cluster       Data       Disk        QoS      NVRAM      Cloud  FlexCache    SM Sync
--------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
-total-              -   367.00us   155.00us     3.00us   161.00us        0ms        0ms     0.00us        0ms        0ms        0ms
data1-wid30897   30897   312.00us   160.00us        0ms   152.00us        0ms        0ms     0.00us        0ms        0ms        0ms
-total-              -   902.00us   153.00us     5.00us   151.00us     8.00us        0ms     0.00us        0ms        0ms        0ms
data1-wid30897   30897   307.00us   150.00us        0ms   149.00us     8.00us        0ms     0.00us        0ms        0ms        0ms
-total-              -  1139.00us   149.00us     7.00us   141.00us     9.00us        0ms     0.00us        0ms        0ms        0ms
data1-wid30897   30897   284.00us   145.00us        0ms   138.00us     1.00us        0ms     0.00us        0ms        0ms        0ms
-total-              -   343.00us   147.00us     5.00us   145.00us        0ms        0ms     0.00us        0ms        0ms        0ms
data1-wid30897   30897   286.00us   146.00us        0ms   140.00us        0ms        0ms     0.00us        0ms        0ms        0ms
  • There may be no delay centers showing any significant latency from qos statistics volume latency show, but client side reports high latency.

 

Sign in to view the entire content of this KB article.

New to NetApp?

Learn more about our award-winning Support

NetApp provides no representations or warranties regarding the accuracy or reliability or serviceability of any information or recommendations provided in this publication or with respect to any results that may be obtained by the use of the information or observance of any recommendations provided herein. The information in this document is distributed AS IS and the use of this information or the implementation of any recommendations or techniques herein is a customer's responsibility and depends on the customer's ability to evaluate and integrate them into the customer's operational environment. This document and the information contained herein may be used solely in connection with the NetApp products discussed in this document.