TIP
Oracle Enterprise Linux bundles many features not automatically
available with the corresponding Red Hat distributions, such as
OCFS2 and the ASMlib library. More importantly, Oracle Enterprise
Linux is supported and tightly integrated with Oracle Unbreakable
Linux, a support program for Oracle on Linux solutions through
Oracle MetaLink.
We will show you how to set up a three-node RAC; although a two-node RAC can
demonstrate most the features of a RAC, you will need a three-node RAC to see how the
remaining nodes in the cluster can still operate as a RAC and recover from the loss of a single
node in the cluster. In practice, the more nodes in the cluster, the less impact there is to
throughput when one node in the cluster fails.
On each node, the Oracle software will reside in a shared ORACLE_HOME; the database and
recovery files will use ASM disks configured with Oracle ASMLib, and the OCR and voting disks
will use raw devices.
Raw Device, ASM,
or File System Name
Physical Device Name Capacity Purpose
DVOL1 /dev/sdc1 10GB ASM Disk #1: +DATA1
DVOL2 /dev/sdd1 10GB ASM Disk #1: +DATA1
RVOL1 /dev/sde1 10GB ASM Disk #2: +RECOV1
RVOL2 /dev/sdf1 10GB ASM Disk #2: +RECOV1
/dev/raw/raw5 /dev/sdg1 512MB OCR Disk
/dev/raw/raw6 /dev/sdh1 512MB Voting Disk
/dev/raw/raw7 /dev/sdi1 512MB OCR Disk Mirror
/dev/raw/raw8 /dev/sdj1 512MB Voting Disk Mirror
/u01 /dev/sdk1 8GB Shared Oracle binaries
/dev/raw/raw9 /dev/sdl1 512MB Second Voting Disk Mirror
TABLE 10-1 Raw Disks for ASM Disk Groups, the Voting Disk, and the OCR Disk
354 Oracle Database 11g DBA Handbook
NOTE
As an alternative to ASM and raw disks, Oracle Cluster File System
(OCFS) version 2.
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