Installation guide

Chapter 1. Red Hat High Availability Add-On Configuration and
Management Overview
Red Hat High Availability Add-On allows you to connect a group of computers (called nodes or
members) to work together as a cluster. You can use Red Hat High Availability Add-On to suit your
clustering needs (for example, setting up a cluster for sharing files on a GFS2 file system or setting
up service failover).
Note
For information on best practices for deploying and upgrading Red Hat Enterprise Linux
clusters using the High Availability Add-On and Red Hat Global File System 2 (GFS2) refer to
the article "Red Hat Enterprise Linux Cluster, High Availability, and GFS Deployment Best
Practices" on Red Hat Customer Portal at https://access.redhat.com/site/articles/40051.
This chapter provides a summary of documentation features and updates that have been added to
the Red Hat High Availability Add-On since the initial release of Red Hat Enterprise Linux 6, followed
by an overview of configuring and managing the Red Hat High Availability Add-On.
1.1. New and Changed Feat ures
This section lists new and changed features of the Red Hat High Availability Add-On documentation
that have been added since the initial release of Red Hat Enterprise Linux 6.
1.1.1. New and Changed Feat ures for Red Hat Ent erprise Linux 6.1
Red Hat Enterprise Linux 6.1 includes the following documentation and feature updates and
changes.
As of the Red Hat Enterprise Linux 6.1 release and later, the Red Hat High Availability Add-On
provides support for SNMP traps. For information on configuring SNMP traps with the Red Hat
High Availability Add-On, refer to Chapter 10, SNMP Configuration with the Red Hat High Availability
Add-On.
As of the Red Hat Enterprise Linux 6.1 release and later, the Red Hat High Availability Add-On
provides support for the ccs cluster configuration command. For information on the ccs
command, refer to Chapter 5, Configuring Red Hat High Availability Add-On With the ccs Command and
Chapter 6, Managing Red Hat High Availability Add-On With ccs.
The documentation for configuring and managing Red Hat High Availability Add-On software
using Conga has been updated to reflect updated Conga screens and feature support.
For the Red Hat Enterprise Linux 6.1 release and later, using ri cci requires a password the first
time you propagate updated cluster configuration from any particular node. For information on
ri cci refer to Section 2.13, “ Considerations for ri cci ” .
You can now specify a Restart-Disable failure policy for a service, indicating that the system
should attempt to restart the service in place if it fails, but if restarting the service fails the service
will be disabled instead of being moved to another host in the cluster. This feature is documented
in Section 3.10, “ Adding a Cluster Service to the Cluster” and Appendix B, HA Resource
Parameters.
Red Hat Ent erprise Linux 6 Clust er Administ rat ion
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