ProductsDesktop Server Red Hat Enterprise Linux OpenStack Platform For IBM POWER For IBM System z For SAP Business Applications Red Hat Satellite Management For Scientific ComputingExtended Update Support High Availability High Performance Network Load Balancer Resilient Storage Scalable File System Smart Management Extended Lifecycle SupportAccelerate Automate Integrate Red Hat JBoss Developer Studio Portfolio Edition Web Framework Kit Application Platform Web Server Data Grid Portal Fuse Red Hat JBoss A-MQ SOA Platform BRMS Data Services Platform JBoss Operations Network JBoss Community or JBoss enterprise
SolutionsWhy Red Hat Why open hybrid cloud? The new IT Public cloud Cloud resource library Private cloud Infrastructure-as-a-Service (IaaS) Platform-as-a-Service (PaaS) Cloud applications and workloadsSolaris to Red Hat Enterprise Linux Migration overview Migrate from your UNIX platform How to migrate to Red Hat Enterprise Linux Upgrade to the latest Red Hat Enterprise Linux release JBoss Enterprise Middleware Benefits of migrating to Red Hat Enterprise Linux Migration services Start a conversation with Red Hat
TrainingClassroom training Red Hat Online Learning Virtual training Remote classroom training On-site team training Online Learning LabsPopular and new courses Red Hat JBoss Administration curriculum Core System Administration curriculum Red Hat JBoss Middleware Development curriculum Advanced System Administration curriculum Linux Development curriculum Cloud Computing, Virtualization, and Storage curriculum
ConsultingSOA and integration Business process management Cloud and Virtualization Custom Software Development Enterprise Data and Storage Systems management Migrations
The High Availability Add-On enables applications to be highly available by reducing downtime and ensuring that there's no single point of failure in a cluster. It also isolates unresponsive applications and nodes so they can't corrupt critical enterprise data.
Fencing and unfencing
The High Availability Add-On provides fencing capabilities, removing access to resources from a cluster node that has lost contact with the cluster, thereby protecting resources, like shared storage, from uncoordinated modification.
After SAN-based fencing and reboot of the fenced node by an administrator, the node can unfence itself upon joining the cluster. It can then access storage without any further administrative intervention.
The Conga application of Red Hat Enterprise Linux provides centralized configuration and management for the High Availability Add-On. In Red Hat Enterprise Linux 6, the web interface to luci has been redesigned and runs on TurboGears2, which provides a rich GUI-based cluster management and administration utility.
System administrators can now enable, capture, and read cluster system logs via a single cluster configuration command.
Virtualization is pervasive throughout today's enterprise datacenters. Not only is Red Hat Enterprise Linux designed to be a superior guest on any of the major hypervisors, it can also be a virtualization host.
Virtualization is integrated directly into the Red Hat Enterprise Linux kernel using Kernel-based Virtual Machine (KVM) technology. As part of the kernel, your administrators get the complete breadth of Red Hat Enterprise Linux system management, and security tools and certifications.
And now, you can run virtualized KVM guests as managed services.
Contact Red Hat Sales to learn more about or buy the High Availability Add-On.
Red Hat works with an ecosystem of partners to build, optimize, and deliver complete solutions. Through our global network of leading hardware, software, and service provider vendors, Red Hat offers you a wealth of proven technology solutions that solve real-world business challenges.
Read our purchasing guide for information on how to purchase Red Hat Enterprise Linux Add-Ons.
Technical details about Red Hat Enterprise Linux Add-Ons: