Support Policies for RHEL High Availability clusters - Transport Protocols

Updated -

Contents

Overview

Applicable Environments

  • Red Hat Enterprise Linux (RHEL) with the High Availability Add-On

Useful References and Guides

Introduction

This guide lays out Red Hat's policies regarding the communication transport protocols available for usage in RHEL High Availability clusters. Users of RHEL High Availability clusters should adhere to these policies in order to be eligible for support from Red Hat with the appropriate product support subscriptions.

Policies

knet transport: Red Hat's support for this transport protocol is subject to the following conditions:

  • RHEL 8: The knet (a.k.a. kronosnet) transport protocol is supported on all package releases.
  • RHEL 7: The knet transport protocol is not supported by Red Hat.
  • RHEL 6: The knet transport protocol is not supported by Red Hat.
  • knet supports up to 8 communication addresses for each node; that is, it supports 8 membership rings. Each membership ring must be on different network because of a limitation in the kernel that is outlined in the following article: How to connect two network interfaces on the same subnet? Instead of using multiple rings on the same network, use bonding or teaming over a single membership ring.

udpu transport: Red Hat's support for this transport protocol is subject to the following conditions:


udp transport with broadcast messaging: Red Hat's support for broadcast messaging mode within the udp transport is subject to the following conditions:

  • RHEL 8: udp transport with broadcast messaging is not supported by Red Hat.
  • RHEL 7: udp transport with broadcast messaging is supported on all package releases.
  • RHEL 6: udp transport with broadcast messaging is supported on all package releases.
  • Broadcast may not be used in clusters utilizing an IPv6 network as the interconnect. Either udp with multicast or udpu must be used.

udp transport with multicast messaging: Red Hat's support for multicast messaging mode (the default unless broadcast: yes is specified) within the udp transport is subject to the following conditions:

  • RHEL 8: udp transport with multicast messaging is not supported by Red Hat.
  • RHEL 7: udp transport with multicast messaging is supported on all package releases.
  • RHEL 6: udp transport with multicast messaging is supported on all package releases.

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