Installation guide

12 Chapter 2. Hardware Installation and Operating System Configuration
Table 2-2. Improving Availability and Data Integrity
Figure 2-1 illustrates a hardware configuration with improved availability. This configura-
tion uses a fence device (in this case, a network-attached power switch) and the nodes are
configured for Red Hat GFS storage attached to a Fibre Channel SAN switch. For more
information about configuring and using Red Hat GFS, refer to the Red Hat GFS Adminis-
trator’s Guide.
Figure 2-1. Hardware Configuration for Improved availability
A hardware configuration that ensures data integrity under failure conditions can include
the following components:
• At least two servers to run cluster services
• Switched Ethernet connection between each node for heartbeat pings and for client net-
work access
• Dual-controller RAID array or redundant access to SAN or other storage.