Disk Storage
The shared disk drive may or may not be a RAID device to support redundancy; more importantly
the disk controllers and connections to the shared storage should be multiplexed to ensure high
availability. If the disks in the shared drive are not mirrored, you can use the mirroring capabilities
of ASM to provide performance and availability benefits.
For the purposes of the examples in this chapter, I will use a Linux server with the device
configuration listed in Table 10-1. These disks reside on a shared SCSI storage device and have
the same device name on each node in the cluster.
There are five raw disks that are 512MB in size reserved for the voting disk, the OCR disk,
and their mirrors (one mirror for the OCR disk and two mirrors for the voting disk); I will present
the uses for these disks in the section ???Cluster Ready Services.??? The shared file system /u01 uses
Oracle Cluster File System (OCFS2) to share the Oracle executable files among all nodes in the
FIGURE 10-1 RAC network configuration
Chapter 10: Real Application Clusters 353
cluster, saving installation time and duplication of the same Oracle executables on each node in
the cluster.
Installation and Setup
For the examples in this chapter, we will use Oracle Enterprise Linux (based on Red Hat Enterprise
Linux) to install the RAC and demonstrate its features. However, most, if not all, the installation
tips, techniques, and methods presented in this chapter will be applicable to other Unix-like
platforms and even Windows-based installations.
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