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Cluster Network Latency - Troubleshooting Guide

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Applies to

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

Description

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

 

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