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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: