1.2. Red Hat Cluster Suite Introduction
- Cluster infrastructure — Provides fundamental functions for nodes to work together as a cluster: configuration-file management, membership management, lock management, and fencing.
- High-availability Service Management — Provides failover of services from one cluster node to another in case a node becomes inoperative.
- Cluster administration tools — Configuration and management tools for setting up, configuring, and managing a Red Hat cluster. The tools are for use with the Cluster Infrastructure components, the High-availability and Service Management components, and storage.
- Linux Virtual Server (LVS) — Routing software that provides IP-Load-balancing. LVS runs in a pair of redundant servers that distributes client requests evenly to real servers that are behind the LVS servers.
- GFS — GFS (Global File System) or GFS2 (Global File System 2) provides a cluster file system for use with Red Hat Cluster Suite. GFS/GFS2 allows multiple nodes to share storage at a block level as if the storage were connected locally to each cluster node.
- Cluster Logical Volume Manager (CLVM) — Provides volume management of cluster storage.
NoteWhen you create or modify a CLVM volume for a clustered environment, you must ensure that you are running the
clvmddaemon. For further information, refer to Section 1.6, “Cluster Logical Volume Manager”.
- Global Network Block Device (GNBD) — An ancillary component of GFS/GFS2 that exports block-level storage to Ethernet. This is an economical way to make block-level storage available to GFS/GFS2.
Figure 1.1. Red Hat Cluster Suite Introduction