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2.3. Clustering and High Availability
- Utilizing CPG API for inter-node locking
- 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
- Support for redundant ring for standalone Corosync, BZ#722469
- 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
- corosync-cpgtool, BZ#688260
- The corosync-cpgtool now specifies both interfaces in a dual ring configuration. This feature is a Technology Preview.Package: corosync-1.4.1-7
- Disabling rgmanager in /etc/cluster.conf, BZ#723925
- As a consequence of converting the
/etc/cluster.confconfiguration 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:- rgmanager must refuse to start if it sees the
<rm disabled="1">flag in/etc/cluster.conf. - rgmanager must stop any resources and exit if the
<rm disabled="1">flag appears in/etc/cluster.confduring a reconfiguration.
Package: rgmanager-3.0.12.1-12 - libqb package
- 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, BZ#456895
- 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
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