2.3. Clustering and High Availability

Rgmanager includes a feature which enables it to utilize Corosync's Closed Process Group (CPG) API for inter-node locking. This feature is automatically enabled when Corosync's RRP feature is enabled. Corosync's RRP feature is considered fully supported. However, when used with the rest of the High-Availability Add-Ons, it is considered a Technology Preview.

Package: rgmanager-3.0.12.1-12

Red Hat Enterprise Linux 6.3 includes support for redundant ring with autorecovery feature as a Technology Preview. Refer to Section 3.7, “Clustering” for a list of known issues associated with this Technology Preview.

Package: corosync-1.4.1-7

The corosync-cpgtool now specifies both interfaces in a dual ring configuration. This feature is a Technology Preview.

Package: corosync-1.4.1-7

As a consequence of converting the /etc/cluster.conf configuration file to be used by pacemaker, rgmanager must be disabled. The risk of not doing this is high; after a successful conversion, it would be possible to start rgmanager and pacemaker on the same host, managing the same resources.

Consequently, Red Hat Enterprise Linux 6 includes a feature (as a Technology Preview) that forces the following requirements:

Package: rgmanager-3.0.12.1-12

The libqb package provides a library with the primary purpose of providing high performance client server reusable features, such as high performance logging, tracing, inter-process communication, and polling. This package is introduced as a dependency of the pacemaker package, and is considered a Technology Preview in Red Hat Enterprise Linux 6.3.

Package: libqb-0.9.0-2

Pacemaker, a scalable high-availability cluster resource manager, is included in Red Hat Enterprise Linux 6 as a Technology Preview. Pacemaker is not fully integrated with the Red Hat cluster stack.

Package: pacemaker-1.1.7-6