As noted
earlier, you can have more than one public and more than one private interface; on this screen
you can also mark an interface to not be used at all by CRS.
In Figure 10-5, you specify /dev/raw/raw5 as the raw disk for the Oracle Cluster Registry and /
dev/raw/raw7 as the mirror location; as of Oracle Database 10g Release 2, you can use CRS (instead
of an external disk management system such as RAID) to mirror your OCR disk to further enhance
availability. The OCR is a metadata repository for the cluster configuration, keeping track of things
like where a particular service is running, if it is running, and so forth.
FIGURE 10-2 Executable file locations
362 Oracle Database 11g DBA Handbook
FIGURE 10-3 Cluster configuration
FIGURE 10-4 Private interconnect enforcement
Chapter 10: Real Application Clusters 363
In a similar fashion, you specify the location of the voting disk for CRS. In Figure 10-6, you
specify /dev/raw/raw6 and /dev/raw/raw8 as the raw disks for the voting disk. You can specify
up to two additional mirror devices for the voting disk using OUI. The processes known as
Cluster Synchronization Services (CSS) use the voting disk to arbitrate cluster ownership and
interprocess communications in a cluster environment. In a single-instance environment, CSS
facilitates communications between the ASM instance and the RDBMS instance.
After the pre-installation summary screen shown in Figure 10-7 appears, you click the Install
button and the installation begins.
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