Skip to main content
NetApp Knowledge Base

Cluster Network Latency - Troubleshooting Guide

Last Updated:

Applies to

  • ONTAP 9
  • All FAS and AFF clusters with 2 or more nodes


What is a cluster interconnect?
  • The term "cluster interconnect" or "cluster network" refer to the Ethernet network allowing nodes in a cluster to communicate with each other
    • This network is used to provide a single client and administrative view of a multi-node cluster without
    • When a client connects to a network interface on the cluster, it can access data in the Storage Virtual Machine (SVM) it has access to, irrespective of which node the data resides on
    • File access for any request is forwarded to the correct node and returned over the cluster network.  
  • For faster performance and resiliency, NetApp has expanded the number of size and speed of the cluster interconnect
    • Currently on FAS/AFF platforms, from two to eight Ethernet ports are supported with speeds of 10GbE, 40Gb, and 100GbE
What is a homogenous cluster interconnect vs a heterogeneous cluster interconnect?
Homogenous cluster interconnect
  • Each node in the cluster has equal number of cluster Ethernet ports
  • Each node's cluster ports are at equal speeds
  • Example: A 4 node cluster has 4 10Gb Ethernet ports per node
Heterogenous cluster interconnect
  • A disparity exists between the number or speed of cluster ports
  • If using a 40Gb Ethernet breakout cable, the speed is considered 10Gb not 40Gb
  • Example: Some nodes may have 4 10Gb Ethernet ports, while some may have 2 40Gb Ethernet ports in a Cluster
What is the impact of a heterogeneous cluster interconnect?

Note: For more articles on other causes, see the article Cluster Network Latency - Troubleshooting Guide


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.