Skip to main content
NetApp Knowledge Base

High network latency in an iSCSI SAN environment

Views:
1,031
Visibility:
Public
Votes:
1
Category:
ontap-9
Specialty:
perf
Last Updated:

Applies to

  • NetApp FAS/AFF systems
  • iSCSI Protocol

Issue

  • Workloads on hosts accessing LUNs via iSCSI incur significant application and client latency
  • ONTAP has low latency (less than 5 milliseconds) in latency counters
  • Network latency in SAN environment is seen in the Network delay center or Network in Active IQ Unified Manager (AIQUM) but not in Network Processing under the Cluster Components volume view

Example:

qos statistics volume latency show shows high latency in the Network column for three SAN workloads

cluster::> qos statistics volume latency show -node san_node1
Workload        ID    Latency    Network    Cluster       Data       Disk        QoS      NVRAM      Cloud 
----------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
volume_SAN1  17882     20.51ms    20.51ms      0ms        0ms        0ms        0ms        0ms        0ms  
volume_SAN2   5232     15.00ms    15.00ms      0ms        0ms        0ms        0ms        0ms        0ms  
volume_SAN3  17160     16.00ms    16.00ms      0ms        0ms        0ms        0ms        0ms        0ms  

 

 

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.

 

  • Was this article helpful?