Skip to main content
NetApp Knowledge Base

Slow LUN read performance for ONTAP 9.3 to 9.9

  1. Last updated
  2. Save as PDF
Views:
500
Visibility:
Public
Votes:
0
Category:
ontap-9
Specialty:
perf
Last Updated:

Applies to

ONTAP 9.3 to 9.9

Issue

  • Latency is seen due to ONTAP having latency in the network layer of qos statistics volume latency show.
  • 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

 

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.