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High Availability
On-demand failover makes applications highly available
The Red Hat® Enterprise Linux® High Availability Add-On provides on-demand failover to make applications highly available. It delivers continuous availability of services by eliminating single points of failure.
Failover
The High Availability Add-On also enables failover for off-the-shelf applications, like Apache, MySQL, and PostgreSQL. Any of which can be coupled with resources like IP-address and single-node file systems to form highly available services. You can also easily extend the Add-On to any user-specified application that's controlled by an init script per UNIX System V (SysV) standards.
How it works
When using the High Availability Add-On, a highly available service can perform a failover from one node to another with no apparent interruption to cluster clients.
The Add-On also ensures absolute data integrity when one cluster node takes over control of a service from another cluster node. It achieves this by promptly evicting nodes from the cluster that are deemed to be faulty using a method called fencing, which prevents data corruption. The High Availability Add-On supports several types of fencing, including both power-based and storage area network (SAN)-based fencing.
LessBENEFITS & FEATURES
Clustering, fencing, and unfencing
Clustering
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.
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Rich GUI for cluster management and administration
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.
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System administrators can now enable, capture, and read cluster system logs via a single cluster configuration command.
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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.
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WORKS WITH
Red Hat Enterprise Linux Server
Add high availability to your Red Hat Enterprise Linux Server.
HOW TO BUY
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.
RESOURCES
Technical details about Red Hat Enterprise Linux Add-Ons:
