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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.

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Red Hat CLUSTER SUITE 4.7 DM MULTIPATH Guida di Installazione Pagina 28